1966 pontiac 421 engine specs

Math, not gasoline, makes horsepower under the hood of a Pontiac. Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. 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). Specifications listing with the performance factory . 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. He thinks the stock exhaust flow of 180 cfm will suffice for this build. 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). See profiles, photos, and specifications of, Muscle cars came in many shapes and sizes. 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. Primary tube length: approximately 31.00 inches Only about 2000 like this one were built with 4 speed Muncie transmissions. . The last "true" Pontiac V8s, a 265 and 301cuin (4.3 and 4.9L), ended production in early 1981. This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421 . Returns; . Various Pontiac sources have emphatically stated that NO 310hp (231kW) versions of the SD-455 were installed in regular production cars. It had a four-barrel carburetor, dual exhaust, and higher compression, and was good for 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 - 1966 and the final year, 1967. 1966 Pontiac Catalina Specifications and Production. moniker from the shaker due to the disappointing public approval as the motor was not deemed to be "High Output". Optional engines included the 356hp Tri-Power as seen on our feature car (code WH manual or YJ auto), or the 421HO, rated at 376hp . The 421 was first availabe in a SD (Super Duty) model that was built for racing. Paul Stenquist. The V8 was phased out in 1981, replaced by GM "corporate engines" such as the Chevrolet 305 cu in small block V8. Seat pressure: 110 pounds at 1.600-in View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. The 421 also marked the end of the option for a forged-steel crankshaft. Low-performance and two-barrel applications, the standard engine in full-sized Pontiacs, got 1.96in (49.8mm) intake and 1.66in (42.2mm) exhaust valves and pressed in rocker arm studs. Block/Crank combo: '64 four-bolt 421 / '64 OE 4.00-in stroke $6.49 shipping. As a result, peak horsepower dropped from 310 to 290, though torque increased from 390 to 395lb. From 1955 through 1959, the Pontiac V8 was also used in some GMC pick-up trucks. NASCAR race cars embody the muscle car philosophy of power. A three-speed stick was standard; a four-speed and automatic cost extra. 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 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). Standard in the Firebird Trans Am, it was still a rare engine. in., again available only in the GTO and Firebird. By 1965 and 1966 the same combinations would be rated at 338hp (252kW) for the 4bbl and the two Tri-Power versions would be rated at 356hp (265kW) and the H-O version at 376hp (280kW). The GTO came with a four-barrel 389 V8 with 335 horsepower. The block is still at standard 421 bore size (4.09375") and will be bored to fit standard size forged 428 pistons (4.120"). Valvesprings: Crower, dual no damper Pontiac offered Tri-Power on select models and engines (347, 370, 389, and 421 CID) from 1957 through 1966, when it was finally . Even more powerful were the 421 Super Duty V8s that could produce up to 410 horsepower. [citation needed]. The Armasteel cast crankshaft was the standard hardened cast-iron crankshaft used throughout the entire Pontiac V-8 line until 1967. Lobe separation angle: 112-deg gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS ( SAE gross . The 389 was the standard engine for the Pontiac Grand Prix and Pontiac Bonneville and installed in the Pontiac GTO through 1966. For those who may not be familiar with the equation, here it is again: Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. Keepers: Comp Cams race locks gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS . Thus, the quest to find 100 hp in a 421 started on the flow bench, before a wrench or machine tool touched any part of the 49-year-old engine. 1966: 421: 9782611 (late) 1967-1969. Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. Pontiac Engine Torque Specifications. The 326 subsequently became the optional V8 engine for Tempests, and later the Pontiac Firebird, through 1967 and maintained the 17 degree cylinder head valve angle for its entire production run. 1969 - 400 Ram Air III or 350HO Code 48. Price $15500.00. It was rated at 250hp (186kW) with 8.6:1 compression and 260hp (194kW) at 10.25:1 compression. With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. The 428 was factory installed in large cars only. They came up with a 269-cubic-inch (4.4L) L-head design. Regarding Crower's upgrade suggestions for its . Preparation: Magnaflux, check for equal stroke and index, grind, polish 0.010-in What is important is the total timing, the . Free shipping on many items | Browse your favorite brands | affordable prices. 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. After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400cuin (6.6L). [22]. Three two-barrel carburetors, 10.75:1 compression, 290hp (216kW) @ 5000rpm, 375lbft (508Nm) @ 2800rpm. 18 watchers 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? Pontiac continued to manufacture its own engines, distinct from Buick, Cadillac, Chevrolet, or Oldsmobile, until 1981. This is the original car featured in the May 1962 issue of Motor Trend Magazine that was modified by Royal Pontiac and driven by Jim Wangers. Bore/Stroke: 4.150/4.00-in Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Catalina Vista 421HO Trophy V-8 Tri-Power 4-speed in 1964 the model with 4-door hardtop sedan body and V-8 6902 cm3 / 421.2 cui, 276 kW / 375 PS / 370 hp (max) offered since October 1963 for North America U.S. special version. 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. Manage Settings The 670 heads were used until May 1967 when they were upgraded to become the "97" heads, which were then replaced late in the model year by the "997" heads which incorporated the upgrades of the "97" heads. 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Pontiac went to open-chambered heads in some 1967 models and all 68 and up to improve power, engine breathing and reduce emissions. The W72 301 was a tuned L37 301 Pontiac V8 with some minor upgrades. ENGINE. 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). The 303 had shorter connecting rods, smaller 2.5in (64mm) journals and a solid lifter version of the Ram Air IV camshaft. A total of 1,808 Ram Air IV production cars were built over its 2-year production. 1. Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. 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. 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. 540306 featured 1.92/1.66-inch (49/42mm) valves and was carried over from the previous model year, production stopped in March 1962 and then casting No. By comparison, the factory 421 H.O. 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. / 8.3 mpg (U.S.) / 3.6 km/l, more data: 1966 Pontiac Catalina 2 . Wires: NAPA Belden 7 mm During 19511952, Pontiac had 23 287cuin (4.7L) V8-equipped 1953 model production prototypes running tests on the GM proving grounds. The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. The V8 engine was introduced for the 1955 model year as the "Strato Streak". Preparation: Install in rod, torque, measure ID These same heads were also used on the 1964 GTO 389 tri-power engines. In 1974 it was used in the GTO and was rated at 200hp (149kW) (net). In addition to the inline 6, Pontiac used the Oakland V8 for one year, 1932, debuting the Pontiac straight-8 engine in 1933. Along with being cheaper to build, this allowed more consistent valve action with less weight than a conventional shaft. To learn about it, read. It could only be ordered with a TH200 automatic transmission and a 2bbl configuration. The tri-power equipped XS-code 389 was shipped with the Ram Air pan in the trunk, and the dealer had to fit it and cut out the underside of the hood scoop to make it functional. Sponsored Stories . 093: 66 389 GTO: 65 . Jim Taylor knows this, so he took a mathematical engineering-style approach to finding 100 hp in a relatively optimized engine. Horsepower: See Part 2 This new material had stronger alloys in the iron. Oil pan: 8-quart with extended pick-up, fabricated retention clamp 1966: 421: 9782611 (late) 1967-1969. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. Officially named the Quadra-Power 400 for 1967 and renamed 400 HO for 1968, the 400 HO was first offered for 1967 as the third engine in the GTO line after the automatic-only 400 2-barrel and the standard 400 4-barrel (the 400 HO would not be offered in the Firebird until the 1968 model year). Nevertheless, there appears in the October 72 issue of MOTOR TREND, a road test of a 1973 SD-455 Grand Am. The first letter equals the month. For 1959 the V8's stroke was increased to 3+34in (95.3mm), raising displacement to 389cuin (6.4L). The engine compartment of this concours Catalina is beautifully finished. A Pontiac SD 421 came with forged steel rods and crankshafts for extra durability. and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). Size cfm: Total flow, 1,050 cfm The 1980 301 Turbo was rated at 210hp (157kW) at 4400rpm and 345lbft (468Nm) @ 2800rpm. of torque at 3,800 RPM in the GTO, and 340 HORSEPOWER at 5,300 RPM and 430-lb.ft. . intake duration and later 1964 L with 288deg intake essentially the same as the 068 cam. The 400 remained in production through the 1978 model year, with 1979 cars receiving engines produced the previous year. . Also, a rumored 75 cars were built with non-Super Duty 421 engines rated at 320 bhp. The 338-bhp four-barrel was the base engine. In 1961 and 1962 they were available with either one 4 barrel carburetor or a dual 4 barrel carburetor setup depending on whether the buyer wanted to head to the racetrack or drag strip. The W72 package was a standalone option, and although was discounted when ordered in conjunction with the Y82/Y84/Y88 Special Appearance package, did not come included with Special Edition Trans Ams, it remained an extra cost option. Rocker studs: ARP special 34-in bottom All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up. 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. [4] It was replaced by the 455 for the 1970 model year. While all this sounds great, remember the engine will have to retain the small 1.92-inch intake valve because chamber space is too tight for larger ones. The company says engines running this cam benefit from headers, cylinder-head port work, a large-cfm carb, and an ignition upgrade. Kits for Pontiac applications. The other major difference between the "typical" Pontiac engine of the time was that this one used the large . For 1971, Pontiac introduced another High Output (HO) version with standard internal parts, a reinforced block with four-bolt main bearing caps, and improved cylinder head design with 18-inch taller (3.2mm) intake ports and special round exhaust ports for better breathing, yet still making just 335hp (250kW) gross (or 310hp (231kW) in the more accurate SAE Net system). Information and specs for the Pontiac 421 V8 engine. Reductions in reciprocating weight free up horsepower. Displacement began at 287-cubic-inch (4.7L) and grew as large as 455-cubic-inch (7.5L) by 1970. This engine was first offered in 1967 as the top engine option in full-size Pontiacs. 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. It was rated at 366bhp (273kW) (gross) in the GTO version. This was based on results of over 1 million test miles, which was unheard of at the time. Ram Air induction was optionally available with the 455 HO in the Firebird Formula(standard on Trans Am), GTO (standard with "The Judge" package), and 2-door LeMans Sport when the T41 Endura Styling Option was also ordered. "1966 Pontiac 2+2" Stock Pontiac Engine Specs. Along with proper parts selection, accurate machining and assembly are also important It used a declutching fan, special exhaust manifolds, and chrome low-restriction air cleaners; rocker covers and oil-filler cap also were chrome. Cougar pulled out of Mustang's shadow with the striped and spoilered 1969 Mercury Cougar Eliminator. ENGINE TYPE Water-cooled V-8, cast iron block and head Displacement 428 in 3, 7015 cm 3 Power 390 hp @ 5200 rpm 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? The 455 HO designation made its debut in 1970; Rated at 360 or 370hp (268 or 276kW) (depending on which vehicle it was installed into) & 500lbft (678Nm) of torque, it differed from the regular full sized car 455 by large valve heads with smaller combustion chambers, and a larger camshaft. All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . It included a new camshaft with duration increased from 288/302 (No. There was also the addition of dual exhaust, and for vehicles equipped with a manual transmission, a slightly more aggressive camshaft. 1969 - 400 Ram Air III Code 62. According to GM mandates horsepower was now rated in net figures as opposed to gross, so on paper the 1972 455 HO appeared to have a significant drop in power, but in fact it was very much the same engine, and performance figures reveal this to be true. The 1979 Firebird model line was the last year for the Pontiac 400, and by this point not only was it required with the 4-speed manual transmission, it also required the WS6 Special Handling Package as mandatory equipment. Though never factory-installed in any car, the ultimate engine of the Ram Air line of engines was the tunnel-port Ram Air V. In 1969 Pontiac created four versions of the Ram Air V engine: a 303cuin (5.0L) short deck version for SCCA Trans-Am racing, a 366cuin (6.0L) variant for NASCAR, a 400cuin (6.6L) version for street use in GTOs and Firebirds, as well as a 428cuin (7.0L) adaptation for drag racing. Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. 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. According to the engineers who worked on the project, the SOHC 421 engines produced around 625hp and were capable of turning 7,000 rpm. Fuel line size: 38-inch, 516-inch to carburetor of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. More 400cuin (6.6L) engines were produced by Pontiac than the other versions - estimates range from 80 to 200 units. [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. Chamber: Closed, special to PMD, 70 cc HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. In light of this, the 'Year' entry, as indicated by the chart below, may actually represent the year that the heads were cast, versus the year that they were actually installed on an automobile. Oil pump: . However, a few dealers would offer them in the GTO or Firebird and do their own installations, such as Royal Pontiac who offered the "Bobcat" conversion. This money bought a potent 389 V-8 with 267-283 bhp . 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. A concave rear window, fender skirts, and ribbed die-cast lower body trim, augmented the Grand Prix's upscale appearance. Preparation: Weigh, soap-and-water wash It was removed from the design for the 1960 model year because designers moved the generator and the power steering pump from atop the front of the engine down to the front of the heads to accommodate a lower hoodline. 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. Preparation: Wash after balance for assembly Pontiac began as a "companion make" to the Oakland division of the General Motors line of automobiles in 1926. Are you thinking of buying a 2007 muscle car, or any other car? This 1966 Pontiac 2+2 Convertible is a beautifully restored big-block convertible that is ready for some boulevard cruising! 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. Initial advance: 18-deg All 1977-1978 Trans Ams ordered with the 4-speed Borg Warner Super T-10 manual transmission received the W72 T/A 6.6 engine. Both of these engines were originally dealer-installed options, but since the NHRA moved to limit racing eligibility to factory-available options on cars available to the public, Pontiac made the SD 421 a factory option for 1962, and most of the approximately 164 SD 421 engines were installed in the Catalina, with another 16 being installed in . 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. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". 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). Year: CU IN: Casting # 1967: 326. This was to ensure there was enough fuel to cool the cast offset dished pistons. The consent submitted will only be used for data processing originating from this website. Most Pontiac engines were painted light blue. The L75 455 engine continued as an option into the 1976 model year for the Trans Am, however, Pontiac opted to drop the "H.O." Headers: Hooker Super Comp (for dyno test) 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. Like the 326, it was offered in both 2-barrel and 4-barrel versions. Head mods: Port, cook, magnaflux, glass bead, convert to screw-in studs A higher-output version was offered, called the 326 HO (High Output). An example of data being processed may be a unique identifier stored in a cookie. Stock Pontiac Head Specs * During my searching for information, I found quite a few discrepancies in the sources I was viewing. The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. 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.. The 1955-up Pontiac V8 that finally reached the public was an overhead valve engine with cast iron cylinder heads and block and wedge-shaped combustion chambers. Bore/Stroke ratio: 1.04:1 The Ram Air IV replaced the Ram Air II in 1969. Pushrods: LPC chrome moly in. 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. . Well, gaze upon these numbersa 421ci Pontiac with Tri-Power carburetion. 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. By 1949 work on a 287cuin (4.7L) OHV V8 had begun, but moved along slowly.

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