1966 pontiac 421 engine specs

A concave rear window, fender skirts, and ribbed die-cast lower body trim, augmented the Grand Prix's upscale appearance. This had extra-rich "DX" secondary metering rods and a remote vacuum source for the primary metering rod enrichment circuit to allow the Power Enrichment Vacuum Regulator (PEVR) to release the primary metering rods to move to the up position (enrichment) anytime during boosted conditions. Price $30000.00. 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. Valvesprings: Crower, dual no damper The GTO came with a four-barrel 389 V8 with 335 horsepower. He wanted to confirm his parts are up to the task of holding the cylinder pressure that creates horsepower. Installed position: 110-deg In 1977 the 400-cubic-inch (6.6L) T/A 6.6, (RPO code W72) was created to fulfil the performance engine gap in the Pontiac line-up. It featured a smaller bore of 3+34in (95.3mm) coupled with the same 3in (76.2mm) stroke of the 301 (same bore and stroke used by Chevrolet when the first small block motor was introduced in 1955). Whether all were installed in GTOs is unknown. With an identical bore and stroke of 4+116in (103.2mm) and 3+34in (95.3mm) it was precisely half the displacement of the 389 and shared numerous parts with the V8,[1] yet weighed considerably more than half as the engine lower half and block casting were not simply divided down the middle. [citation needed] It was the first engine that incorporated Pontiac's round-port head design in a production vehicle, however the intake port was the same as other D-port heads, leaving a head which exhaust port could nearly match the intake at high valve lifts. release the 421 V8 officially to the general public and the motor would continue to be available until the end of the 1966 model year. Ram Air induction was optional in the GTO, though power ratings were unchanged. This new material had stronger alloys in the iron. 3.75. Laconic would be one way to describe this Pontiac's eBay listing, all it states is, "1966 Pontiac Ventura, 421 Tri-Power, 4 speed Runs/ Drives Great, Very Clean - Garage Kept".OK then, now you know what I know. . Effectively, Pontiac's V8s were all small blocks, sharing the same connecting rod length 6.625 in (168.3mm) (except for the later short deck 301 and 265 produced in the late 1970s and early 1980s before Pontiac adopted universal GM engines). According to the June 2019 issue of Muscle car Review magazine, during dyno testing performed during that era, the National Hot Rod Association (NHRA) rated this Pontiac W72 400 T/A 6.6 engine at 260 to 280 net horsepower instead of the 220-hp rating published by Pontiac. Bore and stroke were 4.121in 2.84in (104.7mm 72.1mm) 303.63cuin (4,976cc). Pontiac still offered the regular 455 (RPO L75) in its full sized cars, and after a negative public reaction for dropping the 455 engine, it was re-introduced mid-year as an available option for the 1975 Pontiac Trans Am. Turn adjusting screw in Clockwise until engine misfires, then turn screw out 1/2 turn . Tri Power engine however was optional. This camshaft sported a 308-/320-degree duration with 0.47-inch (12mm) lift. HP = flow at 28 in/H2O x 0.257 x # of cylinders. Likewise, the top 428 carried the same 376-hp rating as the 1966 Pontiac 421 Tri-Power motor. Rod/Stroke ratio: 1.65:1BOTTOM END Transistorized ignition was available. If you enjoy the videos and would like to Sponsor me on Patreon, my Creator link is https://www.patreon.com/MyCarStoryWithLouOn "My Car Story" we're in Huntl. To determine horsepower from airflow, invert the equation: Pontiac's SCCA Trans-Am program was promising, with race-ready engines producing 475hp (354kW) to 525hp (391kW), however the series General Competition Rules required the manufacturer to produce no less than 250 vehicles with the 303. Initial advance: 18-deg 1968 - 400 Ram Air II Round Port Code 96. The valve angle was reduced from 17 degrees to 14 degrees for better breathing. Pontiac's V8s share the same 6.625in (168.3mm) connecting rod length, with the exceptions of the later short deck 301, 265, and 303 Ram Air V. Most Pontiac V8s had an overall length (to the edge of the water pump pulley) of 28.25in (718mm), an overall width of 27in (690mm), and a height (not including air cleaner) of 31in (790mm). Engine displacement is a function of bore and stroke. The 1979 W72/WS6 equipped Trans Am was considered to be one of the overall best performing cars of the decade due to having a powerplant that produced more power than any other competitor on the market at the time with handling equipment to supplement the performance.[12]. For '65, the 421-cid V-8 became a standard part of the option package, and for '66, Pontiac made the 2+2 a separate model, still based on the Catalina two-door hardtop or convertible.Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. I don't know if it can be done, but I'm going to try." The other major difference between the "typical" Pontiac engine of the time was that this one used the large . An evolution of the RA IV and H.O. One version of the engine featured camshafts driven off the front of the engine, another design had the cams driven by gears off the back of the engine. As a result, peak horsepower dropped from 310 to 290, though torque increased from 390 to 395lb. For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. A three-speed stick was standard; a four-speed and automatic cost extra. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). . The initial press cars that were given to the various enthusiast magazines (e.g. The camshaft was also revised to have a slightly higher duration, the carburettor jets tuned and a dual exhaust was implemented allowing the power to increase to 220hp (223PS; 164kW) at 4000 rpm and 320lbft (434Nm) of torque at 2800 rpm. The SD-455 used round-port cylinder heads similar to those used on the 1971 and 1972 455 HO, with specific "LS-2" intake and cast-iron exhaust header manifolds. Paul Stenquist. The four-barrel version with 10.5:1 compression upped horsepower to a healthy 285. . After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400cuin (6.6L). Required airflow at 28 in/H2O = HP/ # of cylinders/0.257 Pontiac Engine Torque Specs Pontiac Engine Torque Specs. Method used to retain pins in pistons: . Simply called "Ram Air" by Pontiac[17] it was the first in a series of engines available from Pontiac as regular production line options and officially called Ram Air. Pontiac continued to manufacture its own engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile, until 1981. For those who may not be familiar with the equation, here it is again: Some 400s were dealer installed. At the request of Ed Cole, general manager of Chevrolet, the layout was also used by the Chevrolet V8 released in 1955, an exception to the customary GM policy of allowing a division one year of exclusive use of an internally developed advance. Pontiac continued using its round-port cylinder-head design for 1971-'72 on the 455 HO. In 1967, the Pontiac 2+2 became an option on the . Simply put, what good is the power if the engine does not last? 1963 Pontiac V8 Engine Specs. The 400 2-barrel kept the 17 degree valve angles for '67; starting in '68 all Pontiac V8s went to the 14 degree valve angle. Brand: Fel-Pro head and intake/ SCE pan and timing cover A higher-output four-barrel carburetor version was offered, called the 326 HO (High Output). In 1967, Pontiac moved on to a technologically simpler nodular cast iron (invented in late 1940s) crankshaft, which they used until 1975. The 421SD was available in 1961 as a dealer option or over the counter then in 62 and 63 from the factory, and was fitted with a list of internal modifications designed solely to withstand the abuse of drag racing. 1966 Pontiac Ventura Specifications. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. See Consumer Guide Automotive's New-Car Reviews, Prices, and Information. Most likely prompted by its development of the Pontiac OHC six, the GM division built three different experimental SOHC 421 CID V8 engines in the early 1960s. For 1967, Pontiac retired the 389cuin (6.4L) and replaced it with the 400cuin (6,554cc), a 389 bored-out by +0.06in (1.5mm) to a bore and stroke of 4.12in 3+34in (104.6mm 95.3mm). In 1968 the 326 was replaced by the similarly 389-derived 350, which used a 3+78in (98.4mm) bore and 3+34in (95.3mm) stroke for a total displacement of 353.8cuin (5,798cc). Pontiac introduced the OHC 6 in two flavors for '66: a base engine with a one-barrel carburetor that developed 165 hp at 4700 rpm, and a sportier version with a 10.5:1 compression ratio, a high-lift cam, a split exhaust manifold, and GM's new four-barrel Quadrajet carburetor (below). or choose Generic to see kits that might fit a . 301 4-barrel 'W72' or 'ESC' (170hp, 127kW) (with the 5th character of the VIN being a "W" for 1979-1980 and the 8th for 1981). Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. In 1969, Pontiac unveiled its Trans Am model Firebird, and since racing rules required engines of less than 5L (305.1cuin), Pontiac unveiled the 303 for racing models only, never available to the public. HOT ROD and CAR AND DRIVER) were fitted with the Ram Air IV-spec camshaft and functional hood scoops - a fact that has been confirmed by several Pontiac sources. Exhaust: 180 cfm at 0.500-in Chamber: Closed, special to PMD, 70 cc While production of 196970 A-body Ram Air IV cars was low at just 1563 units(759 1969 GTOs including 302 Judges, and 804 1970 GTOs including 397 Judges) 1969 and 1970 model year F-body Ram Air IV cars were even rarer at just 245 total units produced. This was to ensure there was enough fuel to cool the cast offset dished pistons. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. [4] It was replaced by the 455 for the 1970 model year. In 1974 it was used in the GTO and was rated at 200hp (149kW) (net). Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. - P.B. So large are the intake ports that the pushrods run through the center of each port via pressed-in tubes, in addition to streamlined airfoils over the tubes themselves to improve port shape, and increase flow velocity. The beginnings of Pontiac's iconic Ram Air dynasty began during the 1965 model year. Final torque ratings may vary and need to be determined based on application and parts used. The Ram Air IV replaced the Ram Air II in 1969. Apparently at least one of these engines survives under the hood of an engineer's personal Pontiac. Styling for Status. gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS ( SAE gross . Along with proper parts selection, accurate machining and assembly are also important. (imp.) Along with a cam swap it boosted horsepower from 325 hp with the four-barrel carb to 348 hp in '64. The inlets were all well within the boundary layer that exists close to the surface, so all of these systems would more accurately be described as "outside air induction" systems, benefiting from the intake of cooler, and thus denser, outside air versus the comparatively hotter and less dense air under the car's hood. Well, gaze upon these numbersa 421ci Pontiac with Tri-Power carburetion. The short deck engine weighed about 40lb (18kg) less than the other variants and had an 8000 rpm redline. Displacement began at 287-cubic-inch (4.7L) and grew as large as 455-cubic-inch (7.5L) by 1970. 1968 Pontiac GTO 428 / Royal Bobcat. Unique exterior features included "2+2" badges, twin lens taillamps, and chrome bodyside gills; Pontiac's famous eight-lug aluminum wheels were the ultimate optional touch. Tri-Power equipped Pontiac hot roda stout piece by anyone's standards. The camshaft was the HO cam with 288/301 duration. The W72 Performance Package also included an upgrade to the rear differential ratio, setting the rear gear ratio to 3.23 for all 1977 and 1979 W72 Firebirds, with the exception being 3.42 for 4-speed equipped W72 Firebirds in 1978 only. Duration at .050: 247/252-deg They came up with a 269-cubic-inch (4.4L) L-head design. Around January 1966 Pontiac took the next step and began offering as a factory option the XS-code engine. 1966: 421: 9782611 (late) 1967-1969. All Rights Reserved. The 1971 Pontiac 455 HO was Pontiac's first engine to receive a special 800cuft/min (23m3/min) Rochester Quadra-jet carburetor with specific jetting. Once corrected the SD-455 was recertified and was released for production in late April 1973. Optional was the obligatory four-speed manual or new-for-1965 Turbo-Hyramatic three-speed automatic. Every torque specification should be in this table, however if there is one missing, please Contact Me and I will get you the spec and add it to the table. These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. The concept car Pontiac Strato-Streak was used to introduce the V8 and in later years the engine was installed in Pontiac products. Pushrods: LPC chrome moly It was factory rated at 366hp at 5,400 RPM and 445lbs.ft. Now select an engine model (if applicable) -- Pontiac Engine Models -- All Pontiac Kits 151 301 326 350 3800 389 4-cylinder 400 421 428 455 Brodix Heads Edelbrock Heads Iron Duke L67 Pro Stock Dart Heads Pro Stock Heads Ram Air Runner Heads Super Duty Generic V8. 744) and a new valve spring package with dampers to positively control valve action. 1966 Pontiac 2+2 $64,995. Hewing to GM's standing edict limiting engine size to 400 cu in for its midsize and smaller cars, the 360hp (268kW) (underrated),[citation needed] the 400 cubic inch Ram Air V-8 was the most powerful and advanced option available in the 1967 GTO and Firebird. Mods: Intake port match, valve bowl blend, improved short-turn radius Brand: Crower PN 60311, solid It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. 5 January 2007. [citation needed]. The "455 HO" moniker took on a whole new meaning with the introduction of the 1971 model year; Intended as a low compression progression from the previous years Ram Air IV engine, all 1971 455 HO engines used a heavy duty 4 bolt main block, round port cylinder heads (casting #197; with 8.4: compression), "Ram Air" style exhaust manifolds, and a two-part aluminum intake manifold. 1966 Pontiac Complete 389 Engine YC code 290 HP Block Catalina . Often called the "Ram Air III", this engine was officially called the "400 Ram Air" for 1969 and then simply "Ram Air" for the 1970 model year. Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8. Email Email. On this Wikipedia the language links are at the top of the page across from the article title. Two-barrel carburetor, 8.5:1 compression, 227hp (169kW) @ 4600rpm, 333lbft (451Nm) @ 2300rpm, Four-barrel carburetor, 10:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Two-barrel carburetor, 10.0:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Four-barrel carburetor, 10.25:1 compression, 270hp (201kW) @ 4800rpm, 359lbft (487Nm) @ 2900rpm. Mods: Flow-test indicated '66 center carburetor would be required to improve total cfm, adapter made to fit '66 center carburetorIGNITION The 1975 455 HO package received some negative press/reviews as some buyers expected to see a return of the 1971-1972 engine, and were disappointed when they received the lower output motor. The cylinder heads on the 400 CID version had an intake port volume of 290cc (17.70cuin), nearly twice the size of a typical standard D-port Pontiac head - and flowed in the area of 315cuft/min (8.9m3/min) @ 0.8in (20mm) valve lift; in the realm of the NASCAR-dominating Chrysler 426 Hemi. The V8 engine was introduced for the 1955 model year as the "Strato Streak". Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust The crankshaft in the 428 had a "N" cast on them (designating nodular steel) as opposed to the 421's Armasteel. of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. A new engine was fast-tracked, its relatively late start allowing it to take advantage of developments proven in the Oldsmobile V8 and Cadillac V8. It added '421' engine badges on the front fenders, 2+2 insignia on the deck lid and rear fenders, and simulated louvers behind the front wheel cutouts. Mechanical advance: 36-deg at 3,200 rpm The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. in. Based on the same short-deck as the 301, the "LS5" 265.1cuin (4.3L) was offered only in 1980 and 1981. For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. In addition, a shallower spherical-wedge combustion chamber moved the tuliped valve heads .040" closer to the piston at TDC, improving mixture draw considerably during the intake stroke.

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