302 with gt40p heads horsepower

If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. So I've got the motor and heads already for my maverick project. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? Because its all been done time after time after. The tube headers showed a gain of almost 100 hp! It took him and yours truly eight hours from start to finish, using air tools and a lift to gain access to the header flanges. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. Anythoughts? I have to agree, the GT40P heads flow better than the GT40 iron heads. Generally expect with a good cam, intake, roller rockers and a good ignition system to see around 300-350 max rear wheel horsepower, depending on what type of dyno you use. JavaScript is disabled. Through Central Coast you can have the heads fully prepped for your combination. That's more than enough to feed a power-brake booster. When combined with modern power-makers, such as nitrous, the 302 is more than capable of producing 400+ horsepower for little more than the cost of a stock engine rebuild. The results were a major increase in power throughout the entire rev range, with an increase of 60hp at 4500rpm through to a peak of 279hp at 5800rpm. The asterisk HP differences are calculated using Test 1's 294-hp peak. Yea. No-option stripper- I like strippers. An aggressive cam will wake it up a bit. We know what you're thinking--only two-tenths from an extra 45 hp? Tim's junkyard refugee survived the beating and we had a bitchin' story. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. Common sense would suggest that with the heavy lifting complete and the old cam removed, by not installing the new roller lifters along with the camshaft could be asking for the possibility of trouble just a few thousand miles down the road. I was looking at putting on the GT40P heads on. The Fora platform includes forum software by XenForo. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. But dont think that adding a bigger camshaft will make more power. I'd get the gt40 setup, and put an s trim on it. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. JavaScript is disabled. just curious. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. I'm an old school guy (289 in 65 mustang), and I'm just looking into the new 5.0 engine (roller cam) stuff recently. AFR 165cc 58cc Heads. I need that part number too! this head is complete with new 1.837 int valves and 1.536 exhaust valves. Buy the lifters for peace of mind now and hopefully for the duration. At the dragstrip, we gained two-tenths and 2 mph. This will cost additional money but is still worth it, in our opinion. THANKS VERY MUCH! Free shipping for many products! Limited header choice is certainly a challenge. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. Using the manufacturer recommended springs for your camshaft are a safe bet. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Small-block Fords and Mopars only use four head bolts per cylinder, so retaining proper head-gasket sealespecially with nitrousis a point that demands attention, so we ordered a set of Fel-Pro MLS head gaskets rather than a standard, composition gasket. Location: Re: Stock Ford 351W 4bbl dyno numbers. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. This is an older thread, you may not receive a response, and could be reviving an old thread. GT40s have 64cc chambers. Required fields are marked *. When building an engine there is a lot to take into consideration. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. I turned it because it was tired when I got it. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. Do not ever, ever think about using the tube type manifolds. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. However, theres a distinct possibility that I might pull all of my hair out if I see another in-depth article explaining how I, along with just over a billion other desperate humans seeking answers, need special valve spring split locks for my next tired Chevy build. We compare the GT40s to modern cylinder heads as well as other heads from the era. Yes- thank you. United Engine and Machine sells cheap but decent pistons that will do what you're wanting. Cloudflare Ray ID: 7a2e2d95dedea1e4 GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? For all of us interested in Gt40p heads. These are Ford iron GT-40P heads. K.S. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. The Fora platform includes forum software by XenForo. +1 I would go with the regular GT40 heads. A forum community dedicated to Ford Mustang owners and enthusiasts. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. Depending on the Headers you have you might be okay. At the time, I was still running smog equipment in a 1994 Mustang GT, so I had them drill the back of the heads for the thermactor connection. The only failures Ive had were timing chains and a couple broken rods in a mid 80s 302 with 200,000 miles on it that got about 35 lbs of boost stuffed into it when a pop off valve I bought on ebay failed. i know a guy who used to build race engines so he has all the right tools, how much would it help to get the heads ported and polished or anything else he could do to them. If you're running a stock cam, 1.7 rockers will work perfectly. This will keep you from dropping your overall static compression ratio and losing power. . These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. Ford Factory 5.0 Performance Cylinder Heads. Your IP: Performance & security by Cloudflare. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Motor is going into a Ranger. The "P" heads flow better. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Because of this, your tuneup will probably need to be modified. Both swaps made more sense when parts were readily available at the bone yard for cheap. The GT40 and GT40P cylinder heads are highly sought after, but how do they stack up against other cylinder heads, and is it worth it to upgrade the Fox Body's stock heads? You can have your current 28 oz rebalanced to 50. I must agree with Jeff Smith. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. All in all, the addition of GT-40P heads to any 5.0 Mustang is a worthwhile venture, especially if you're on a budget (aren't we all) or shooting for the Trophy Stock title. Its always refreshing to see a FORD getting a little face time in your column, even if its a tired 302 with no great expectations of setting the world on fire when the dust settles. Mar 23, 2004. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. Torque on the other hand isnt something to write home about. As with all head installations, check piston-to-valve clearance before final startup. The only way to really make more power is to go with a stroker kit, blower and/or heads. And remember ENGINES have been being built/rebuilt/modified for years. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. K.S. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. There are a lot of variables that must be addressed to give a better estimate, but a good basic estimate is 20-40 HP at the crank. This time around, we chose a shining example of this junkyard art form. Install a set of 1.7:1 roller-tipped rocker arms on the heads. We started with a 120,000-mile 5.0L out of a Ford Explorer, removed the EFI and DIS, and pocket ported the stock GT40P iron heads with stock valve sizes. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. The spark plug issue is almost a non-issue. I would like to know what heads, cam and intake manifold combination to use for the most HP I can squeeze out of that motor. Its increase while significant is still only about that of a decent 351 w, hi im building a nastalgic car so im not going to drag race it but it must go ok ive got a 302 windsor basicly recoed stock but i want to run tunnel rams to go with the the3am would like to put choppy cam and replace the heads any ideas would be much apprecited thankyou, What is the stock head cc of a 1992 f150 302 windsor. In order to make Coyote-type power you will need some expensive, high-flow cylinder heads with a short block that can withstand spinning in excess of 6,500 rpm. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. For a better experience, please enable JavaScript in your browser before proceeding. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. any input is apprecciated:smartass: Thank you for the info, if all I have to worry about is the plugs then I'm in good shape hahaha. Hey all, I'm working on building a 302 with my gt40p heads. Here is my setup. SBF FORD Aluminum Cylinder Heads 302 /351w 190cc 62cc 2.02 /1.60 For ROLLER CAM. The specs are a conservative 212/218 degrees of duration at 0.050-inch tappet lift but offer a really nice 0.512-inch valve lift for both the intake and exhaust. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . I've got gt40p heads for it I'll be running, and can't afford better . It runs smooth but seems lazy. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. (Image/Harrison Creamery). We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. And have discovered something that I dont think anyone else knows. We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The car weighs #2835 with driver. T5z and 3.89 9" TL rear. Then why did you port the heads and how do you know if you made an improvement. Just put some 1.7 pedistal rocker arm on along with a mild camshaft (make sure to use the correct valve springs), you will make over 300 flywheel hp. JavaScript is disabled. Go for it if you get them super cheap and can get headers/manifolds super cheap as well but otherwise I'd say it's a waste of time and money. Anyways, I know the gt40ps will bump . AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Again, assuming this is a nearly stock 5.0L with stock heads, the Weiand Street Warrior dual plane intake and 600 cfm carburetor, its important to not become overly aggressive and choose a big camshaft. Yep my **** is coming apart again Isnt life great! Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. JEGS High Performance. 1983 Mustang G.T. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. Keep in mind that swapping camshafts is a fairly extensive effort. Many years ago, a friend bought a used 2001 Mercury Mountaineer 5.0L that was equipped with a set of really decent GT40P style iron heads. I'm running stock GT40 heads with stock 4.000 bore on cylinders and a Lunati cam with 256/262; Duration @ .050 (Int/Exh): 213/219; Gross Valve Lift (Int/Exh): .483/.499; LSA/ICL: 112/108. In an effort to preserve the history of the Early Fox Era, FEP covers the following vehicles: 79-86 Mustang and Capri, 84-86 Mustang SVO, 78-83 Fairmont & Zephyr, 83-86 LTD & Marquis, 80-88 Thunderbird & Cougar, 82-87 Continental, 84-92 Mark VII, 81-82 Granada. Just make sure it is a roller cam. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. For a better experience, please enable JavaScript in your browser before proceeding. 68 Mustang GT/CS Highland Green, PS, PB & Console, C Code w/C4 & 3.55 8 rear, If you aren't using the GT40P's stock, with maybe a spring upgrade and valve job, they aren't worth it anymore. The SUV indicated barely 120,000 on the clock, and after yanking the valve covers to judge the engine's condition, Tim Moore instantly made the decision to do the boneyard version of a smash-and-grab. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. hole size 302 is 7/16 and 351 is 1/2 He'd be the best source. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. Check my post above. I am sure you have increased the bore size and possibly even the stroke a bit and spin it up pretty high in the RPM range. Yea. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. With gt40p heads and 289 hipo exhaust manifolds changing sparkplugs is the same as the original 302 heads and manifolds, I use the spark plugs that are recomended for the explorer with gt40p heads and you can use straight or angled boots. Win or lose, if you buy the ticket you must take the ride. I'm running BBK un-equal length shorty's, and I'm able to get all the plugs in, tight, and all plug wires on. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? Rowe studied engineering, philosophy and American literature at Central Florida Community College. Compare. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. Sponsored. A COMP hydraulic roller cam we found works well with this combination. You can have your current 28 oz rebalanced to 50. Yank a motor out of the junkyard, clean it up, add a camshaft, intake, and a carburetor, and see how much power we can squeeze out of it. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. The 5.0L with the GT40 head had a 9.0:1 compression, and the 5.0L with the GT40P head had 9.1:1 compression. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. Do you guys have part numbers for the spring kits? We probably could have coaxed an even 300 hp out of this stock configuration, but with such good numbers, we decided to jump right into the first Lunati cam. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. Let us explain. This is the main reason why these engines are not modified as much as the small block Chevy. Even with a stock Mustang 5.0 cam makes good power. The older pushrod engines just dont offer the same kind of power potential for their displacement and it all has to do with cylinder head flow. He'll have to get a gear for his distributor. In order to make Coyote-type power you will need some expensive, high-flow cylinder heads with a short block that can withstand spinning in excess of 6,500 rpm. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. In a 3,250-pound car like a Mustang with 3.50 gears and an automatic with a 2,800-rpm converter, this 5.0L could pull 12.80s at 108 mph. This is what I recommend to everyone who is doing a budget 5.0 build. Nice to see actual dyno results instead of "butt dyno" guesses. I think one of the finer traits of a true car guy, is the patience to put a prized car away and just let it sit for a while rather than selling it when life gets in the way. For those of you running a carb, or aftermarket intake, you already have a leg up in this area and should see even greater gains in power. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. This is a function of the somewhat wider lobe-separation angle of 112 degrees. You didnt mention which cam you had in mind. For a better experience, please enable JavaScript in your browser before proceeding. We bolted the Ford to the dyno with a set of 158-inch long-tube headers and an 18-inch collector extension to help the low-speed torque, then we fired up the small-block. FULL DYNO RESULTS. You could run a thinner head gasket as well. I got lucky and found a complete Explorer GT40P engine online. #1:::Throw out all your Magazines that suggest what to do! Not bad for off the shelf parts and a stock shortblock. Install a "wet" nitrous plate system (which carries both nitrous and fuel) onto the intake manifold and jet it conservatively for a 100 horsepower shot. Stock heads with a fresh 3-angle valve job, shorty headers, T5, 4.10s, stock Explorer intake and stock '88 GT short block with 140,000 miles on it and an E cam in it. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . HiPo manifolds and Ill be good. the engine is carburated of that makes a difference. There's not a lot of reson to use 351 heads later than '75 since they essentially identical to 302 heads except for head bolt holes. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. GT40P heads, what kind of performance do they give? We took the heads to Mike Slover of Slover's Porting Service in Sun Valley, California, to do this work, plus some basic pocket-porting to improve flowespecially on the exhaust side. Not sure how they would mate up to your existing exhuast, but otherwise they should work. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - anyone have experience with GT40P heads on a 92 351W - ive got a 92 F250 with a 351W that needs a pretty serious rebuild. The heads got a 3 angle valve job, new valves from speed-pro and all the valve train was from crane that matched the current hydraulic cam. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. That's a good combo in my book. These engines came with the GT40P head, which even with its small valves, offers really good performance. However I think the opportunity window is slowly closing. 1.7 shaft rockers and beehives. The reason this new generation of Ford engines make a ton more power is they also enjoy fantastic cylinder heads and four valves per cylinder. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. I spin it to 6500 and thats about it. Over $2050 for the 165/185 renegades. Small Block Ford 289/302/5.0L/351w 180cc/60cc Aluminum Cylinder Head E42004. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. - I have a 1989 f150 with a 302 5 spd. The kit offers adjustable power from 50 to 250 hp with a simple jet change. The Fora platform includes forum software by XenForo. Seriously though if you're not planning on an all-out attack for HP, I'd consider a forged piston out of Probe's SRS line-up. thats after 3 hours of idling/midrange hits to tune the idle and part throttle . That said there are some better aftermarket options for heads also. '85 GT vert two tone (white on charcoal)white leather, http://www.facebook.com/groups/233213650060739/, http://www.summitracing.com/parts/TFS-2500100/, ascMcLaren & Motorsport/Grand Prix IV Capris, RHD and Other International/Export Models, Mods, Maintenance & Mechanical FAQs/Archive, If this is your first visit, be sure to The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. These timeslips are from 1280' above sea level. 302 explorer short block with roughly 80k miles GT40's from a local u pull n pay ($97) weiand x-celerator trick flow stage 1 cam 650 holley double pumper car made 322/329 SAE . VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Free shipping. Be careful, I was once bitten by one of those reptile engine builders. You gave me the info I was looking for, and I really do appreciate it. 68stang351 Founding Member May 16, 2002 850 Never not once have I ever seen a SBF rod bolt create a failure. Install a set of GT-40P cylinder heads from a late 1990's Ford Explorer or a set of GT40 heads from an early 1990's Mustang 5.0L. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. I have heard this rod bolt weakness myth for years but have yet to have a single problem with them in any of the SBF engines I have pounded on for the last 30 years and there have been lots of them. GT 500; Posts: 8496; Location: Brisbane . All this is worth it. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. Stock valve sizes? Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. Step 1. Definitely going to use my P heads. Or, you could invest in a new set of heads that would also do the same job but you can expect to spend quite a bit more money. Once the headers are in place, then you can consider if you still want more power. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. Adding the headers may also require a slight increase in secondary (and possibly primary) jetting to ensure the proper air-fuel ratio, but thats also an easy tuning change. The GT40 heads are a bit more versatile, working with the 5.4 and 6.8, while the GT40P (Explorer/Mountaineer) heads will only work on the 6.8 due to an interference issue. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! The reply has so many assumptions that I cant even assume to know the answer. Finding Gt40p heads at the junkyard is getting more and more complicated and if you want to upgrade the heads you have to take into account the costs of the machine shop and compare everything to a set of cheap aluminum heads. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. Joined . According to his data and verified dyno tests with an EFI 302, you can go above this level if you port the stock, lower intake manifold, or upgrade it altogether. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. Overview. Joined: Sun Mar 15, 2009 9:31 am. But the part about a cam replacement possibly being a labor intensive undertaking is correct. ***Most important is theStupid question is the one that was never asked!*** Compare. You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. Part of this reason is due to its inherent strength and simplicity, but a lot of it has to do with how little Ford has changed it over the years. A mild porting with gasket matching will be very good. The only one that's close, is #7. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. The valve seats have been cut on a . I am working on a set of iron GT40s hoping it goes faster. Free shipping. The hardest part of swapping the cam was just getting the timing cover off and back on again. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. That's fantastic for the minimal investment we made. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. Since the engine is nearly stock, we would want to choose a relatively mild camshaft with somewhat more lift and duration than stock, but again not going too aggressive. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . http://vb.foureyedpride.com/showthread.php?t=89153, http://www.facebook.com/groups/233213650060739/, ascMcLaren & Motorsport/Grand Prix IV Capris, RHD and Other International/Export Models, Mods, Maintenance & Mechanical FAQs/Archive, If this is your first visit, be sure to I got a set of AFR heads , night and day. I have a 432 HP non Hi Po 289 I built. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. You need to check. A good port job can set you back another $500-$1,000. I have managed to get 402 horse power from a 289 hipo natural aspirated. Here a comparison of different heads on a 302: I'm very happy with my GT40P. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. These heads have been remanufactured using refaced reclaimed Factory Valves. Posted on May 07, 2014 by promarengine. These are some of the pictures I have showing the Explorer manifolds. The gt40p head is considered the best OEM 302 head made. For this reason, we're not sure what kind of boost the GT-40P heads will give. If you dont feel comfortable doing this higher a pro. I wouldnt recommend reusing lifters though. Just got through porting one of my gt40p heads today. For real performance, stock E7TE heads leave a lot to be desired. So . The dyno recorded a peak horsepower reading of 489 hp, but the air/fuel ratio was slightly on the rich side at 11.5:1, so we increased the nitrous jet to a 61 and hit the button again. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. Actually the regular gt40's in either aluminum or iron are the good ones but the gt40p's are only a slight improvement over regular 302 heads. A LOT of them do it these days. For 2018, the Coyote makes 460 hp. Most all long tubes come out far enough to clear and other short tube headers will work but there is clearance issues on two of the cylinders. How much HP and torque do you think I. Shop by category. made more power everytwhere and 40 hp is respectable. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. Where they differ is the combustion chamber size. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members).

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