10 with 308/320 degrees of duration and 0.445/0.447-inch lift (11.3/11.4mm) with 1.65:1-ratio rocker arms and solid lifters, special #529238 forged-steel connecting rods, forged aluminum 4.09-inch (104mm) bore Mickey Thompson pistons, #542990 forged-steel crankshaft with a 4-inch (101.6mm) stroke and 3+14-inch (82.6mm) diameter main journals. It could only be ordered with a TH200 automatic transmission and a 2bbl configuration. Valves: Competition Products stainless steel, 1.92 /1.66-in ENGINE TYPE Water-cooled V-8, cast iron block and head Displacement 428 in 3, 7015 cm 3 Power 390 hp @ 5200 rpm Pontiac Engine Torque Specifications. Where else will the extra 100 horses come from? ", https://tran-zam.com/fhistory/1977Engines.aspx, "Hitman's Pontiac Trans Am Site - WS6 and WS7", https://tran-zam.com/fhistory/1978Engines.aspx, https://tran-zam.com/fhistory/1975Engines.aspx, "Unsung Muscle: '75 455 HO Pontiac Trans Am", https://tran-zam.com/fhistory/1981Engines.aspx, "Directory Index: Pontiac/1967 Pontiac/1967_Pontiac_Performance_Brochure", "609ci Pontiac Ram Air V - Chief Stomp 'Em", Pontiac experimental V8 427 Hemi TOHC Tamrazs Parts (800) 442-4601, "McKellar's Masterpiece: The Pontiac Overhead Cam 421 V8", https://en.wikipedia.org/w/index.php?title=Pontiac_V8_engine&oldid=1136467635, Articles needing additional references from January 2010, All articles needing additional references, Articles that may contain original research from October 2016, All articles that may contain original research, Articles needing cleanup from September 2022, Articles with bare URLs for citations from September 2022, All articles with bare URLs for citations, Articles covered by WikiProject Wikify from September 2022, All articles covered by WikiProject Wikify, Articles with multiple maintenance issues, Articles with unsourced statements from December 2008, Articles with unsourced statements from April 2021, Articles with unsourced statements from February 2018, Wikipedia articles needing clarification from April 2021, Articles with unsourced statements from July 2016, Articles that may contain original research from September 2018, Articles with unsourced statements from March 2018, Articles to be expanded from February 2020, Articles with empty sections from February 2020, Creative Commons Attribution-ShareAlike License 3.0, 7.9:1, 8.0:1, 8.4:1, 8.5:1, 8.6:1, 8.9:1, 10.0:1, 10.25:1, 10.5:1, 10.75:1, 11.0:1, Two-barrel carburetor, 7.9:1 compression, 192hp (143kW) @ 4400rpm, 297lbft (403Nm) @ 2800rpm, Four-barrel carburetor, 8.9:1 compression, 216hp (161kW) @ 4800rpm, 315lbft (427Nm) @ 2800rpm, Two-barrel carburetor, 8.9:1 compression, 205hp (153kW) @ 4600rpm, 294lbft (399Nm) @ 2600rpm, Four-barrel carburetor, 8.9:1 compression, 227hp (169kW) @ 4800rpm, 312lbft (423Nm) @ 3000rpm. Open pressure: 282 pounds at 1.100-in / 8.3 mpg (U.S.) / 3.6 km/l, more data: 1966 Pontiac Catalina 2 . In the early '60s, the engine program at the Pontiac division of General Motors was a wide-open operation that bustled with innovation. Headers: Hooker Super Comp (for dyno test) and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). Bore/Stroke ratio: 1.04:1 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. From 1959 to 1966 Pontiac continues making improvements. As Pontiac's 1967 performance brochure said, "You can add the Ram Air induction hood scoop and new high output cam and valve springs to the Quadra-Power 400 for better top end breathing." In basic 2-barrel form it produced 290 horsepower and 428ft. pounds of torque in 1968. One of the key modifications over the standard 301 4-barrel was the 301 Turbo block. 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.. There were 11 different Pontiac V8 engine options for 1966, starting with the 326-cid 250-hp Tempest base V8. Rods: Howard's billet 4340 certified steel, stock 6.625-in, floating pins Likewise, the top 428 carried the same 376-hp rating as the 1966 Pontiac 421 Tri-Power motor. What was most interesting about the 421 engine in the beginning was that it was a dealer installed option only known as the SD (Super Duty) 421. Styling for Status. 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). . Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. Both Chevy and Ford had 427 cu in performance engines, so Pontiac simply referred to its 427 as a 428 to one-up them. Whether all were installed in GTOs is unknown. Thus in March 1973 Pontiac eliminated a timing solenoid that gave full vacuum advance and disabled the EGR valve in high gear after a period of time that happened to exceed the running time of the EPA testing cycle. Pontiac offered Tri-Power on select models and engines (347, 370, 389, and 421 CID) from 1957 through 1966, when it was finally . 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. The SD-389 was limited to a single 4-barrel while the SD-421 used dual 4-barrels. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Keepers: Comp Cams race locks Kits for Pontiac applications. 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. RamAir 4 Motor Price $15500.00. This was the last run for the 455 (7.5 L) motor from Pontiac, and production ceased on the 455 this year as it could no longer meet the emissions requirements any longer. Total Timing: 36-deg BTDC Only 630 Bonnevilles were produced for 1957, all of them fuel-injected. The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. 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. The W72 301 was a tuned L37 301 Pontiac V8 with some minor upgrades. In addition to the more refined cylinder heads, block casting reinforcements in the lifter galley and main bearing oil pan rail area, it had forged connecting rods with larger 716-inch-diameter (11mm) bolts. Standard only for the Pontiac Bonneville was Pontiac's first-ever fuel injection system. The 421 SD became factory installed in 1962 and in 1963 a street version became available from the factory with a dual four-barrel or three two-barrel Tri-Power carburetion. The 1981 rendition of this engine was officially called the 301-EC [EC standing for Electronic Controls] in the 1981 GM factory service manual, removing the need for a W72 option separately as it was now the standard motor, similar to how all W72 engines in 1979 were coded L78.[16]. The most famous S/D of them all. Pontiac produced the 421 V8 engine from 1961 to 1968. The 400 remained in production through the 1978 model year, with 1979 cars receiving engines produced the previous year. It was rated at 250hp (186kW) with 8.6:1 compression and 260hp (194kW) at 10.25:1 compression. Jets, Primary: Center #64 adjust power valvespring for 12 Hg at 1,000 rpm Deck Height: 10.215-in It tips the scales at 3,950lbs. 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. Fuel pump: Will use 110-gph Carter 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. Rings: LPC (Liberty Performance Components) premium moly, standard tension The 1971 455 HO was available in the Firebird (optional in Formula; standard in Trans Am), the GTO (standard with "The Judge" package), and the 2-door LeMans, LeMans T-37 (including GT-37), and LeMans Sport. The camshaft was the HO cam with 288/301 duration. 1966 Pontiac Complete 389 Engine YC code 290 HP Block Catalina . Engine Specifications. View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. In 1969, Pontiac also used a revised crankshaft out of a Pearlitic malleable-iron, although it still used the "N" casting letter. 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. They came up with a 269-cubic-inch (4.4L) L-head design. The Ram Air IV heads had 1/8" taller intake ports, larger intake port volume with more airflow, yet shared the Ram Air II round exhaust ports. SPECIFICATIONS. gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS ( SAE gross . The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. The block is still at standard 421 bore size (4.09375") and will be bored to fit standard size forged 428 pistons (4.120"). It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. Duration at .050: 247/252-deg This test would tend to lend credence to the CAR AND DRIVER and HOT ROD tests of 1973 Super Duty cars with 3.42 gears, no air, and 160lb (73kg) less weight as being representative of production specimens capable of mid to high 13-second passes at 104mph (167km/h). This money bought a potent 389 V-8 with 267-283 bhp . By comparison, the factory 421 H.O. 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. [19] The cylinder head design is similar to the Ford FE tunnel-port head used in the GT40 and Can-Am series racing. The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. For 1970 the Trans Am was the only Firebird available with the Ram Air IV, and 88 were produced during the abbreviated 1970 F-body production run. 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. Engine, horsepower, torque, dimensions and mechanical details for the 1966 Pontiac Catalina. Known as GM's performance-oriented division, Pontiac lived up to the hype by creating the first Muscle Car and kicking off the Muscle Car era. The main upgrade for the engine was the ESC, (Electronic Spark Control)[15] which provided slightly more power at 170hp (127kW) with 4.9L (299cuin) for the 19801981 model years. We and our partners use cookies to Store and/or access information on a device. Lobe separation angle: 112-deg Compression ratio was a modest 8.00:1, with valve diameters of 1.781in (45.2mm) (intake) and 1+12in (38mm) (exhaust). (V8) - Stamped on right front side of block or beneath production . I don't know if it can be done, but I'm going to try." The 2+2 package was first offered as a $291 option on Catalina hardtops and convertibles in 1964. Here are features on more than 100, Muscle cars created their own culture. Crower identifies this cam as a Level 4, which means it provides strong midrange and top-end power for heavily modified engines. Maximum RPM (high-RPM engine): over 8000 rpm, Engine weight: estimated 550lb (249kg) complete, Power: estimated 640hp (477kW) at 7500rpm, This page was last edited on 30 January 2023, at 13:15. The 338-bhp four-barrel was the base engine. Balancer: Original PMD rebuilt by Damper Doctor These motors were built mainly for NASCAR or other racing purposes and were equipped with all the extra racing goodies that people were looking for. The Ram Air IV replaced the Ram Air II in 1969. The 421 engine is available only with related heavy-duty driveline components. 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. Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. 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. Despite their work, the division's conservative management saw no immediate need to replace the Pontiac Straight-8 until later in the 1950s. The SD-455 motor was listed as an option in dealer brochures for the 1973 Grand Am and LeMans GTO(and planned for the Grand Prix as well) although none were produced for sale. Some production test cars ran considerably slower and yielded 14-mile (402m) times in the 14.5 second/98mph (158km/h) range in showroom tune (uncited sources)- results that are quite consistent for a car with a curb weight of 3,850 pounds (1,746kg) and the rated 290hp (216kW) SAE NET figure that some sources suggest was "under-rated." For 1965, however, the 2+2 became a bonafide muscle car. The 389 V8 was first introduced by Pontiac in 1959. 1. Model Number: Body/Style Number: Body Type & Seating: Factory Price: . Example: A128 = January 12, 19*8. A higher-output version was offered, called the 326 HO (High Output). 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]. 3.75. 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. 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). They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with the 421 H.O. The first of the "big journal" Pontiac V8s, it had a bore and stroke of 4+332in 4in (104.0mm 101.6mm) and came with dual four-barrel carburetors. Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. Nevertheless, there appears in the October 72 issue of MOTOR TREND, a road test of a 1973 SD-455 Grand Am. Splayed main caps, head bolts tie into main caps. Primary tube diameter: 1.75-in It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. In 1964 when the new "A" body intermediates came out there was a new corporate (GM) engine size limitation to anything less than 330cuin (5.4L). Muscle Cars. This is it! On this Wikipedia the language links are at the top of the page across from the article title. The 1963 Catalina two-door sports sedan pictured here showcases the 421 H.O. 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. Pontiac V8 Engine Codes and Specifications. (imp.) Apparently at least one of these engines survives under the hood of an engineer's personal Pontiac. The first letter equals the month. From 1955 through 1959, the Pontiac V8 was also used in some GMC pick-up trucks. Ultimately Pontiac produced only 295 1973 SD-455 Firebirds (252 Trans Am, 43 Formula). Torque: See Part 2 Oil pan: 8-quart with extended pick-up, fabricated retention clamp Fuel line size: 38-inch, 516-inch to carburetor The fuel-injected engine became an option on any Pontiac model, carrying a staggering price tag of $500 (almost 15% of the car's base price). Coil: GM With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. . engine for 1963 is reported to be putting out 500 ft-lbs torque at 4,200 rpm and . However, it can easily be determined by examining the cost price of the option, where the package excluding the W72 engine cost $251, and with the engine, cost extra at $324.[10]. Greater throughput mixed with the proper amount of fuel and ignited at the ideal time for the flame to expand against the piston will result in more power. Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. The 421 SD produced up . While not related to the 400 W72, the concept was the same. 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. ][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. For the first time, Pontiac offered Tri-Power, three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). The piston weighs 630 grams with the pin versus the stock piston and pin weight of 790 grams. Learn how Classified Ads works . 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. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). This resulted in a lightweight design weighing less than the Chevrolet small-block V-8. The 455 HO package was only available to late model year Pontiac Firebird Trans Am's, and was mandatory with a 4-speed transmission. Note the tri-color Pontiac Ventura upholstery. 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. 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). 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. NASCAR race cars embody the muscle car philosophy of power. For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. The four-barrel 400 was a popular performance option for many of Pontiac's cars. The other major difference between the "typical" Pontiac engine of the time was that this one used the large . 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. All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up. Pontiac ignited the classic muscle car era with a stroke of marketing genius. By 1979, Pontiac was no longer allowed to produce the 400 engine as emissions further tightened. It was rated at 310hp (231kW) @ 4800rpm and 400lbft (542Nm) @ 3,000rpm on 10.5:1 compression. The standard head seen on an L78 400 Pontiac was the low compression 6x8 head, while the 6x4 head seen on the W72 had hardened valve seats for a higher RPM operating range, improved air flow, and higher compression. Optional power was the 421/356 with Tri-Power or the 421 HO putting out 376 horses with Tri-Power. He thinks the stock exhaust flow of 180 cfm will suffice for this build. 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 . Along with proper parts selection, accurate machining and assembly are also important The results showed Pontiac that an L-head simply couldn't compete with an overhead valve engine. Jim Taylor, well-known Pontiac engine builder, had that question on his bucket list for years. 1962 421 super duty motor Price $30000.00. On the invoicing for the 1979 model year Firebirds, they had the option listed as L78, however, every 1979 400 equipped car received a W72 engine. [citation needed]. 1965 Pontiac LeMans GTO Mecum. In 1967, the Pontiac 2+2 became an option on the . Centerline: 110-deg Exhaust: 180 cfm at 0.500-in The 1968 Ram Air II remained at 400 cu. 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). VEHICLE TYPE . Well, gaze upon these numbersa 421ci Pontiac with Tri-Power carburetion. The 2-barrel version was last offered in 1979. All L78 Pontiac 400 equipped cars received the same shaker decal as the L80 Oldsmobile 403, being "6.6 LITRE". One of the key upgrades were the 6x4 heads. 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). This same camshaft was also used in Pontiac's 19691970 RA IV production cars. 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. Free shipping on many items | Browse your favorite brands | affordable prices. 1967 - 400 Ram Air Code 97. In 1967, the cylinder head design was improved for the 400 4-barrel engine. As Pontiac still wanted to offer a performance motor to compete in the performance market, they looked back to the 400 Pontiac and how it could be improved to offer greater performance while meeting CAFE standards. SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. The 421 Super Duty had been the first of these, and their large bore and stoke made them popular in NHRA and NASCAR competition throughout the '60s. 1966 Pontiac 2+2 $64,995. It had 2-bolt main bearing caps in 1969, but went to a block similar to the Ram Air IV's in 1969 that was drilled for 4-bolt main bearing caps (but used a cast crank and cast rods). Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. . 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. The 301 Turbo was unique since it had a beefier block than the 197779 versions (which carried on in the non-turbo versions in 1980 and 1981), a very mild camshaft with 0.35in (8.9mm) lift and 250 degrees gross duration, a 60psi (4.1bar) oil pump to ensure adequate oil to the oil-cooled Garrett TBO-305 Turbocharger, a rolled fillet crankshaft, a fully baffled oil pan, and a specific 800cuft/min (23m3/min) Quadrajet carburetor. The Pontiac 421 HO was the king of the streets in 1963, producing 353 and 370 horsepower depending on carburetor configuration. Pontiac in the 1950s was one of a few US manufacturers that did not regularly identify their engine names and sizes with air-cleaner or valve-cover decals. Instead, they were substituted with the L80 Oldsmobile 403, or the L37 Pontiac 301 if they still requested a 4-speed transmission. 068) to 301/313 (No. Upon reflection, many did not consider that it was the only large displacement engine still on offer for any performance car on the market, and reconsidered Pontiac's position between the rising CAFE emissions restrictions.[14]. On premium fuel, it was rated at 207 hp at 5200 rpm and . By 1963, the more powerful Pontiac 421 was beginning to outshine the 389 for performance applications. 1963 Pontiac V8 Engine Specs. This may have been propagated by the only authorized company that is licensed to reproduce these decals not including the "6.6 LITRE" in the Trans Am decal kits, and only including "T/A 6.6" with no extra cost. [7] Though listed as slightly less powerful than some high-performance iterations of the 400 (such as the 366hp (273kW) Ram-Air), the 455 had 500lbft (678Nm) of torque, 55 more lbft (75Nm). With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. All GTOs built from 1964-66 were powered by a 389-cubic-inch V-8 with 10.75:1 compression. Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. It shared the 4.121in (104.7mm) bore of the 400, but with a 2.84in (72.1mm) stroke for a displacement of 303cuin (5.0L). Pontiac V8 Engine Tune Up Specifications. Paul Stenquist. 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? Made with a provision for dry sump oiling, it truly was a racing engine, detuned for use in passenger cars. Standard ratio with the 400 was 3.55:1(except 3.36:1 in Firebird for 1969) regardless of transmission(3.23:1 for cars with air conditioning). See profiles, photos, and specifications of, Muscle cars came in many shapes and sizes. Piston pins: Icon, SAE 1016 to 1022 The manuals had Hurst shifters. 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. The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. 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. 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. Metallurgy of the critical parts is an area often overlooked, but not by Jim Taylor. The consent submitted will only be used for data processing originating from this website. A three-speed stick was standard; a four-speed and automatic cost extra. Pushrods: LPC chrome moly . Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish The initial press cars that were given to the various enthusiast magazines (e.g. The Fresh Air package continued into the 1966 model year. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. Bolts or Parts: Lube or Sealer: Torque to: Main Caps. Block description: '64 421ci #157 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. . aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389cuin (6.4L) Pontiac V8. The Ram Air IV also used a lightweight aluminum intake-manifold that produced a weight savings of 1015lb (4.56.8kg). Though airflow is paramount in making power, there are other aspects of the engine that are just as important. The 303 had shorter connecting rods, smaller 2.5in (64mm) journals and a solid lifter version of the Ram Air IV camshaft. A set of Hooker Super Comp headers will be used on the dyno, and Jim is porting the stock heads to increase intake-port flow by 30 cfm. 301 2-barrel (135hp, 101kW), (5th character of the, 301 4-barrel (150hp, 112kW), (5th character of the. For a few more ponies through better oil control, a factory full-length windage tray will be added, since Pontiac didn't use one on this engine originally.
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