1966 pontiac 421 engine specs

The valve angle was reduced from 17 degrees to 14 degrees for better breathing. It tips the scales at 3,950lbs. Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. Rear Main Cap. engine, dual exhausts, three-speed manual transmission, Hurst shifter, 3.42:1 rear gears, heavy-duty suspension, bucket seats, upgraded upholstery, carpet, emblems, "Decor" louvers, pinstripes, lower . Here is another number to ponder: 370 hp. From 1977 to 1981 there were 4 distinct 301 versions: For 1981 model year vehicles, the engine codes are the 8th digit of the VIN. Piston-to-deck height: 0.009-in Information and specs for the Pontiac 421 V8 engine. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. Transistorized ignition was available. The 421 SD Tri . All L78 Pontiac 400 equipped cars received the same shaker decal as the L80 Oldsmobile 403, being "6.6 LITRE". Engine Displacement: 432 ci Price $14000.00. Mods: Built to factory specifications/ adapt '64 choke to '66 center carburetor 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. Ram Air induction was optionally available with the 455 HO in the Firebird Formula (standard on Trans Am), and the 2-door LeMans (including GTO). By comparison, the factory 421 H.O. The short-deck block and different intake ports also required the design of a new intake manifold. Only 157 Ram Air IV Firebirds, including 55 Trans Ams, were built for 1969. For the 1978 model year, Pontiac re-incorporated the earlier thicker cast cast engine block denoted by the cast number 418988 and a "XX" cast into the side of the block. In 1963 Pontiac dropped the Buick division built 215 cu. As a result, it was remarkably free of teething problems. 1966: 421: 9782611 (late) 1967-1969. Muscle cars wouldn't have much muscle without horsepower -- but what exactly is horsepower? Since the story of this 421 is better told in pictures, follow along as we take you on this exciting journey! 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). The 1970 '455 HO' was a conventional "D" port engine. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Intake: 218 cfm at 0.500-in Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. All GTOs built from 1964-66 were powered by a 389-cubic-inch V-8 with 10.75:1 compression. Engine Oil: 95 ft-lbs. 301 2-barrel (135hp, 101kW), (5th character of the, 301 4-barrel (150hp, 112kW), (5th character of the. He thinks the stock exhaust flow of 180 cfm will suffice for this build. Year: CU IN: Casting # 1967: 326. Kits for Pontiac applications. 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. Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. Lift: 0.515/0.525 with 1.6:1 rockers 1968 Pontiac GTO 428 / Royal Bobcat. This installment includes the assembly and parts selection up to the long-block. The Pontiac V8 engine is a family of overhead valve 90 V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. 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. Beep, beep! Installed position: 110-deg 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). The Ram Air IV replaced the Ram Air II in 1969. Math, not gasoline, makes horsepower under the hood of a Pontiac. Timing chain: LPC, double rollerINDUCTION It was rated at 250hp (186kW) with 8.6:1 compression and 260hp (194kW) at 10.25:1 compression. superior_queens (3,035) 100%. Pontiac offered this to the public as a streetable version of the 421 SD. The heads were a new design featuring siamesed intake ports. 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. Head bolts do not pull on the cylinder wall causing distortion. Ultimately Pontiac produced only 295 1973 SD-455 Firebirds (252 Trans Am, 43 Formula). A mechanical system built by Rochester, it was similar in principle, but not identical, to the contemporary Chevrolet "fuelie". We and our partners use cookies to Store and/or access information on a device. There were 11 different Pontiac V8 engine options for 1966, starting with the 326-cid 250-hp Tempest base V8. Model Number: Body/Style Number: Body Type & Seating: Factory Price: . Coil: GM If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. 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. For 1958 the V8's bore was increased again to 4+116in (103.2mm), increasing displacement to 369.4cuin (6.1L). It was rated at 360hp @4300 RPM in the GTO and 370 @ 4600 RPM in the Grand Prix and other full-size Pontiacs. The 421 used the same 4.120-inch bore but used the 4.0-inch crank from the 421 it replaced. The very modest cam, combined with a low-compression ratio of 8.4 (advertised) and 7.9:1 actual resulted in 290hp (216kW) SAE NET. Perhaps the most unusual variation of the Pontiac V8 was the 1961-63 Trophy 4, which was a 45-degree inclined 194.43cuin (3.2L) inline-4 created from the right bank of the 389 for the debut of the Tempest. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". Make way for one of the baddest muscle cars of all time, the, An all-aluminum, race-proven V-8 defined the rare and wicked, The engine is what gives a muscle car its flamboyant personality. The 338-bhp four-barrel was the base engine. The 428 was increased to 456.12cuin (7,474cc) in 1970. Modified versions of this engine were extensively used in NASCAR stock car racing and drag racing competition. 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. Secondary: Front and rear #70 In 1969 the 350 HO was upgraded again with the addition of the 400 HO cam, commonly referred to by enthusiasts as the 068 cam. Free local pickup. Spiral clip This S/D retains the original "Traction Master" traction bars and two-bar spinners on the original 8 . designs, the SD-455 was a much improved engine. Sponsored Stories . The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. The shaker wore the decals "455 H.O." or choose Generic to see kits that might fit a . The main innovation of the Pontiac engine was reverse-flow cooling and the stamped rocker-arm system, which had been devised by Pontiac engineer Clayton Leach in 1948. Fuel line size: 38-inch, 516-inch to carburetor The compression ratio will be 10.6:1. Block/Crank combo: '64 four-bolt 421 / '64 OE 4.00-in stroke The W72 was only available for a very short time, with the majority of 1979 model year W72 Firebirds ordered in late 1978. The engine was available in all full-size Pontiacs. This was a completely stock car on loan from a private owner for the test. The company says engines running this cam benefit from headers, cylinder-head port work, a large-cfm carb, and an ignition upgrade. Only one is known to survive today. This money bought a potent 389 V-8 with 267-283 bhp . The basic package included the heavy-duty suspension, with even stiffer springs and shocks available. 5 January 2007. 1. Exhaust: 180 cfm at 0.500-in Melling PN M54D with 60 psi spring, made 70 psi at 6,000 rpm with 30W oil The horsepower ratings of this era were often dubious, with engines rated higher or lower in output for advertising, political, or insurance purposes. Head ID Location Royal Pontiac developed the prototype of the package on their 1965 GTO drag car and Pontiac picked up the idea and in August 1965 Pontiac offered the new Fresh Air package to dealers consisting of the parts and instructions needed to make the hood scoop functional, including the metal tub to mount to the carburetors and rubber gasket to seal it to the underside of the hood. 421 CID V8 - 4BBL - Automatic - P.S. Bore and stroke were 4.121in 2.84in (104.7mm 72.1mm) 303.63cuin (4,976cc). Federal emissions standards and the drive towards "corporate" engines shared among all GM divisions led to the progressive demise of the Pontiac V8 through the late 1970s. A common misconception made by enthusiasts was the notion that all Pontiac engine equipped Trans Ams featured the "T/A 6.6" decal on the shaker, however, it was exclusive to the W72 engine that was featured on less than half of all Trans Ams made during this period. Given how late in the model year it was, Pontiac decided not to incur the costs of recertifying the SD-455 for other models other than the Firebird. 068) to 301/313 (No. Valvesprings: Crower, dual no damper Standard only for the Pontiac Bonneville was Pontiac's first-ever fuel injection system. . Plans were made to produce Firebirds and GTOs with advertised ratings of 355hp (265kW) and 375hp (280kW) respectively but concerns about emissions, the response of the automobile safety lobby, and the warranty implications of a high-revving street engine led to cancellation of the program.[why? A camshaft with 301/313 degrees of advertised duration, 0.407-inch (10.3mm) net valve lift, and 76 degrees of valve overlap was specified for actual production engines in lieu of the significantly more aggressive Ram Air IV-spec camshaft that had originally been planned for the engine (initially rated at 310hp (231kW) with that cam), but ultimately proved incapable of meeting the tightening emissions standards of the era with sufficient margin to satisfy Pontiac emission engineers given expected volume production variations. [19] The cylinder head design is similar to the Ford FE tunnel-port head used in the GT40 and Can-Am series racing. Pre-Owned. Stock Pontiac Engine Specs. ENGINE. 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. Here are features on more than 100, Muscle cars created their own culture. It was rated 180hp (134kW) @ 4600rpm and 264lbft (358Nm) @ 2400rpm with a two-barrel carburetor, 200hp (149kW) @ 4600rpm and 278lbft (377Nm) @ 2800rpm with the four-barrel carburetor. By 1949 work on a 287cuin (4.7L) OHV V8 had begun, but moved along slowly. Based in part on designs for the "short deck" 303cuin (5.0L) engine designed for the 1970 racing season, it had a shorter deck than the big V8, and used thin-wall castings to reduce weight. Muscle Cars. None of Pontiac's Ram Air engines actually enjoyed any true ram air effect. Torque: See Part 2 The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. The Pontiac 421 HO was the king of the streets in 1963, producing 353 and 370 horsepower depending on carburetor configuration. In basic 2-barrel form it produced 290 horsepower and 428ft. pounds of torque in 1968. In the 1960s the popular 389cuin (6.4L) version, which had helped establish the Pontiac GTO as a premier muscle car, was cut in half to produce an unusual, high-torque inline four economy engine, the Trophy 4. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. While the 400 offered excellent power in the GTO (360 horses and 445 lb-ft of torque in 1968), Pontiac turned to what it called 'big journal' engines for the muscle machine's next upgrade. All 1980 Trans Ams received this engine as standard with the option to delete this engine choice as a credit option for the standard L37 301. A concave rear window, fender skirts, and ribbed die-cast lower body trim, augmented the Grand Prix's upscale appearance. Made with a provision for dry sump oiling, it truly was a racing engine, detuned for use in passenger cars. Continue with Recommended Cookies. Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. The 1980 301 Turbo was rated at 210hp (157kW) at 4400rpm and 345lbft (468Nm) @ 2800rpm. and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). The 1968 Ram Air II remained at 400 cu. Valve lift stayed at just over 0.400-inch with 1.5:1-ratio rocker arms. Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. Using an equation the author has provided in HPP many timesmost recently with The Mule engine seriesit was revealed that around 228.6-cfm flow though the intake port of the cylinder head is required to produce the desired 470 hp. Year. It was rated at 475hp (354kW). It was offered in the following forms: For 1957 the V8's stroke was increased to 3.5625in (90.49mm), for a displacement of 347cuin (5.7L). ft. After the SD-455 was certified with the new cam, it was production-ready but was then further delayed by the EPA mandating Pontiac recertify all of its engines when the EPA discovered that part-throttle emissions exceeded the limits. cam specs out at 215/225-degrees duration at 0.050 and has just 0.407/0.407 lift with the factory 1.50:1 rockers. of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. Preparation: File-fit for end gap if needed, wash Nevertheless, there appears in the October 72 issue of MOTOR TREND, a road test of a 1973 SD-455 Grand Am. Given that, it was no accident that the leader in intermediate muscle also put together the finest full-size performance machine -- the 1966 Pontiac 2+2. It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. Preparation: Wash after balance for assembly For the truly obsessed, 16 Grand Prixs were built with Pontiac's 421 Super Duty engines, rated at a staggering 370 bhp. ][citation needed] T, While the exact total number of Ram Air V engines produced is not positively known, only about 25 303cuin (5.0L) engines were produced and about a dozen 428s and 366s. Type Size Carb Horse Power Tourqe; Tri-Power: 389ci: 3x2bbl: 360 hp @ 5200 rpm: 424 lb-ft @ 3600 rpm: Base 8 . This 1966 Pontiac 2+2 Convertible is a beautifully restored big-block convertible that is ready for some boulevard cruising! The Armasteel cast crankshaft was the standard hardened cast-iron crankshaft used throughout the entire Pontiac V-8 line until 1967. Likewise, the top 428 carried the same 376-hp rating as the 1966 Pontiac 421 Tri-Power motor. Pontiac . The 428 was factory installed in large cars only. For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. The beginnings of Pontiac's iconic Ram Air dynasty began during the 1965 model year. Pontiac V8 Engine Codes and Specifications. for 1980, and the 8th being a "T" for 1981). The Pontiac 389 engine was produced from 1959 to 1966, and has a 4.06" bore and 3.75" stroke. The Fresh Air package continued into the 1966 model year. The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. Engine options for the 1966 Pontiac Ventura were a 389 and 421 cubic inch V-8. Keepers: Comp Cams race locks For the first time, Pontiac offered Tri-Power, three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). If you've been thinking about cruising the local boulevard in a classy convertible, but find yourself longing for the power under the hood that only a muscle car provides, perhaps it's time to take another long look at Pontiac's restyled 1965 Bonneville convertible. The 455 HO moniker was again carried over, this time as a near-exact repeat of the 1971 offering, the only changes were the carburetors (they used a conventional 750cuft/min (21m3/min) unit this year), and the head castings (casting #7F6). It was called the Ram Air IV due to the planned use of four air inlets. Casting No. See Consumer Guide Automotive's New-Car Reviews, Prices, and Information. Compression Ratio: 10.6:1 effective The SD-389 was limited to a single 4-barrel while the SD-421 used dual 4-barrels. Along with being cheaper to build, this allowed more consistent valve action with less weight than a conventional shaft. Pontiac's initial plans were to use a camshaft with specs identical to the 041 Ram Air IV camshaft, but testing showed emissions, while technically compliant, did not have "cushion" to satisfy Pontiac's emissions engineers, to avoid production variation leading to any non-compliant engines being produced and sold. On premium fuel, it was rated at 207 hp at 5200 rpm and . Pontiac planned to produce the 1953 models with the V8, but Buick and Oldsmobile appealed to GM management and earned a 2-year delay. View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. Late in the model year the Ram Air 455 HO was made an available option for those GTOs with the optional "The Judge" package. The 421 was first availabe in a SD (Super Duty) model that was built for racing. Are you thinking of buying a 2007 muscle car, or any other car? Idel RPM Automatic In Drive Notes; 326: 1964: 45S: 0.035: . Like the 421, the 428 used a large-journal crankshaft, but externally it was the same size as all Pontiac V-8s of that era (the later 301 used a shorter deck height). By 1963, the more powerful Pontiac 421 was beginning to outshine the 389 for performance applications. Engine displacement is a function of bore and stroke. In 1968, there was also a 350 "HO" which had increased power with the addition of higher compression #18 heads (#17 and #46 were the most common 2-barrel heads), a four-barrel carburettor and matching intake that was also used on the 400 and 428 engines. 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. [4] It was replaced by the 455 for the 1970 model year. Bore/Stroke ratio: 1.04:1 Royal Pontiac's engine swap wasn't a new trick for Pontiac. The valve size increased as well, to 2.11in (53.6mm) intake and 1.77in (45.0mm) exhaust valves on high-performance heads. The stroke increased to 4.21-inch (106.9mm). Three two-barrel carburetors, 10.75:1 compression, 290hp (216kW) @ 5000rpm, 375lbft (508Nm) @ 2800rpm. Manage Settings Pontiac Engine Torque Specs Pontiac Engine Torque Specs. The W72 also featured a camshaft with a higher duration, finer tuned 800cfm Rochester Quadrajet, insulated fuel line, larger 60PSI oil pump, chrome valve covers, a larger harmonic balancer, and the "T/A 6.6" Shaker decal. Displacement (CID) Bore (Inches) Stroke (Inches) Mains (Inches) 1955. Here are my top six rationales for admiring the 1966 GP. Buckets and a console were added to the top-line Catalina interior, which could be optioned with a sport steering wheel and instrumentation that included a tachometer and oil-pressure gauge. 1967 - 400 Ram Air Code 97. As Stock drag racing heated up at the dawn of the Sixties, the factories were serving up a constant stream of engines, transmissions and lightweight body par. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). The 287 was an "oversquare" engine with a bore and stroke of 3+34in 3+14in (95.3mm 82.6mm), for a total displacement of 287.2cuin (4.7L). 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. 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. This was a project started with the end goal of building a 427 Hemi. Unlike previous enlargements of Pontiac V8s, it did not replace the 389. 400 Ram Air (1969) / Ram Air (1970), aka Ram Air III, Learn how and when to remove these template messages, Learn how and when to remove this template message, "Tested: 1968 Pontiac GTO 428 / Royal Bobcat", "1969 Pontiac Grand Prix 428 specifications | technical data | performance | fuel economy | emissions | dimensions | horsepower | torque | weight", "Muscle Car Horsepower How Exaggerated Was It? Pontiac continued using its round-port cylinder-head design for 1971-'72 on the 455 HO. It is a known fact that a person's pupils dilate slightly when viewing something pleasant to the eyes. Additionally, the 301 W72 never received the option to come equipped with a manual transmission like the standard 301 received in 1979, and disappointingly, production for all Pontiac V8's ended soon after as GM sought to "corporatize" engine production. The 455 was used through 1976 when it, as with many other large displacement engines, was discontinued as manufacturers moved to smaller, more efficient models, even in their full size car lines. Engine Specifications. The 1966 Pontiac GTO was also the first car to replace the aluminum grille with plastic mesh-pattern inserts. Method used to retain pins in pistons: . 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]. Rings: LPC (Liberty Performance Components) premium moly, standard tension The engine build will be discussed in two parts. A larger 4in (101.6mm) ram air flex duct to the air cleaner from the left-hand fender, specific carburettor calibration for the Rochester Quadrajet, a "T/A 4.9" callout on the shaker, 60 psi oil pump, and cam similar in grind to the 220hp (164kW) 400 from the 19781979 model year were also included.

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