Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. Boost was wastegate limited to 91psi (0.6210.069bar). 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. And it cruised silently and rode with less harshness than muscle intermediates. 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. Pontiac RAIII/IV Engine parts collection Price $14000.00. [8] All of these improvements provided the W72 with a power rating of 200hp (203PS; 149kW) at 3600 rpm and 325lbft (441Nm) of torque at 2400 rpm, while the standard L78 400 only produced 180hp (182PS; 134kW) at 3600 rpm and 325lbft (441Nm) of torque at 1600 rpm. This money bought a potent 389 V-8 with 267-283 bhp . 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. Three two-barrel carburetors, 10.75:1 compression, 290hp (216kW) @ 5000rpm, 375lbft (508Nm) @ 2800rpm. 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. Retainers: Crower steel Tri-power engine rated at 376 hp. The new-for-1965 "Venturi" body shape and curved side glass were carried over with updates front and rear. Price $30000.00. Unusual for a major automaker, Pontiac did not have the customary "small-block" and "big-block" engine families common to other GM divisions, Ford, and Chrysler. While not related to the 400 W72, the concept was the same. The 455 HO package was only available to late model year Pontiac Firebird Trans Am's, and was mandatory with a 4-speed transmission. [4] It was replaced by the 455 for the 1970 model year. Muscle Cars. 1966 Pontiac Engine Data Location Of Engine Code: (Six-Cyl) - On cylinder head-to-block contact surface behind oil filter pipe. "1966 Pontiac 2+2" Idel RPM Automatic In Drive Notes; 326: 1964: 45S: 0.035: . The four-barrel version, set up for sustained high speeds, had 390 hp. 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. 63 421 SD: 64: D-Port: 2.02/1.76: 77: 65 GTO, 65 421 HO: 65: D-Port: INTAKE MANIFOLD BOLT PATTERN IS THE SAME FOR ALL 65-79 HEADS. Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. A higher-output version was offered, called the 326 HO (High Output). It was rated at 360hp @4300 RPM in the GTO and 370 @ 4600 RPM in the Grand Prix and other full-size Pontiacs. The 421.19cuin (6.9L) was introduced in 1961 as a dealer-installed Super Duty option. That's the factory rating of the legendary 421 H.O. This was to ensure there was enough fuel to cool the cast offset dished pistons. The 455 was fundamentally the same for the 1976 model year, albeit the shaker decal now just read "455". 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. Pontiac V8 Engine Tune-Up and Torque Specifications. in., again available only in the GTO and Firebird. Secondary: Front and rear #70 . The Ram Air IV replaced the Ram Air II in 1969. 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. Rated at 370 horsepower at 5,200 rpm and 460 pounds-feet of torque at 3,800 rpm, it has 10.75:1 compression, with induction through three Rochester two-barrel carbs, Pontiac's well-known "Tri-Power" setup. Coil: GM Pre-Owned. 1966: 421: 9782611 (late) 1967-1969. Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. Bore/Stroke ratio: 1.04:1 For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. 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 valve size increased as well, to 2.11in (53.6mm) intake and 1.77in (45.0mm) exhaust valves on high-performance heads. Brand: Fel-Pro head and intake/ SCE pan and timing cover Turn adjusting screw in Clockwise until engine misfires, then turn screw out 1/2 turn . Cam was a #541596 McKellar No. Although it is much different from the original 1955-vintage Pontiac V-8 powerplant, the 301 has the distinction of being the last true Pontiac V-8 engine, as Pontiac ceased production of these engines effective April 1, 1981. The other major difference between the "typical" Pontiac engine of the time was that this one used the large . Displacement began at 287-cubic-inch (4.7L) and grew as large as 455-cubic-inch (7.5L) by 1970. Not where most enthusiasts go first. 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. Standard motor was the 421 4 barrel with 342 horsepower, which was no slouch itself. The 421 SD Tri-Power engine offered during these years produced the highest horsepower of any motor in the Pontiac V8 lineup at 376 bhp. Maximum flow at 28 inches of water A big chunk of the appeal of the 1965 and '66 2+2 was the fact that you got a standard 421 under the hood: The 338hp, four-barrel 421-cu.in. The basic package included the heavy-duty suspension, with even stiffer springs and shocks available. Only about 400 were produced before the fuel injection system was quietly dropped. Preparation: Magnaflux, check for equal stroke and index, grind, polish 0.010-in 3.75. Even more powerful were the 421 Super Duty V8s that could produce up to 410 horsepower. The W72 was only available for a very short time, with the majority of 1979 model year W72 Firebirds ordered in late 1978. For the truly obsessed, 16 Grand Prixs were built with Pontiac's 421 Super Duty engines, rated at a staggering 370 bhp. Installed position: 110-deg 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. . 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 1980, and the 8th being a "T" for 1981). Information and specs for the Pontiac 421 V8 engine. The camshaft was the HO cam with 288/301 duration. The XS-code 389 was still rated at 360bhp at 5,200 rpm, same as the more common WS-coded Tri-Power 389, but performance was noticeably improved on acceleration runs. The 400 HO was offered as an option for 1967-1970 for GTO and 1968-1970 for Firebird. 287. 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. In 1974 it was used in the GTO and was rated at 200hp (149kW) (net). 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. Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. 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. 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. Located at the back of the engine near the Distributor. Valve seals: U.S. Seal 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. Balancer: Original PMD rebuilt by Damper Doctor An example of data being processed may be a unique identifier stored in a cookie. Factory heavy-duty high-pressure oil pump and eight-quart sump, four-bolt main bearing caps with Moraine aluminum bearings, and #1110976 dual-point distributor without vacuum advance. Not long before the model year introduction, Pontiac management decided that the entire line would be V8-powered. 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. 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. Around January 1966 Pontiac took the next step and began offering as a factory option the XS-code engine. From 1969 though 1970, the Ram Air IV was available in both A-Body (GTO, including Judge) and F-body (Firebird, including Trans Am) form. With A/C On, Engine Hot: 421: 1966: With Tri-Carb, With Air Injection reactor: 45S: 0.035: 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. in. Starting at the bottom, Jim will employ lighter and stronger parts in the reciprocating assembly, as evidenced by the choice of Howards billet rods and forged Icon pistons. Year: CU IN: Casting # 1967: 326. This same camshaft was also used in Pontiac's 19691970 RA IV production cars. The engine was available in all full-size Pontiacs. "Armasteel" was a trademark of pearlitic malleable iron developed by GM's Saginaw Metal Casting Operations around 1936, which was referred to as "locking ball" cast-iron, as opposed to the "flaking" type found in other engines. 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). Bolts or Parts: Lube or Sealer: Torque to: Main Caps. 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. The head design was incorporated from the earlier 1970's 350 Pontiac heads, and could satisfy emissions in all states except for high-altitude emissions states and California. 068) to 301/313 (No. 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). aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389cuin (6.4L) Pontiac V8. Here is another number to ponder: 370 hp. Price $15500.00. Valve guides: K-Line, liners 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. Despite their work, the division's conservative management saw no immediate need to replace the Pontiac Straight-8 until later in the 1950s. Mods: Flow-test indicated '66 center carburetor would be required to improve total cfm, adapter made to fit '66 center carburetorIGNITION Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. Kits for Pontiac applications. Returns; . It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. With the 1964-1967 Pontiac Catalina 2+2, Pontiac achieved a combination of power, road-holding, and fine styling superior to any other big Pontiac, and most of the competition's models besides. 1966 Pontiac 2+2 $64,995. 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). [20] Pontiac asked Mopar (Chrysler, Dodge, Plymouth) for help in designing it and making it work. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. A panel covers the dash opening where the radio would have been on a standard Catalina. Mechanical advance: 36-deg at 3,200 rpm Compression ratio was a modest 8.00:1, with valve diameters of 1.781in (45.2mm) (intake) and 1+12in (38mm) (exhaust). This engine was first offered in 1967 as the top engine option in full-size Pontiacs. Pontiac Engine Torque Specifications. All Pontiac Catalina 2-Door Sedan versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . [citation needed]. 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. In 1968, a 320hp (239kW) HO option was offered in the Tempest and Firebird. 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). Though a change of camshaft would delay production, Pontiac decided to change camshaft, employing one with identical timing to the 744 camshaft, which had been used in the 400 Ram Air(aka Ram Air III) engine with manual transmissions. . 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). True Pontiac engines were designed and built in Detroitnot on a computer, but often by GI-bill-educated engineers who grew up working with their hands and now had a slide rule in their pocket instead of a greasy rag. 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). The 389 would remain the standard Pontiac V8 engine through 1966, offered in a bewildering variety of outputs ranging from 215 to 368hp (160 to 274kW). Bore/Stroke: 4.150/4.00-in 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. Bore and stroke were 4.121in 2.84in (104.7mm 72.1mm) 303.63cuin (4,976cc). Splayed main caps, head bolts tie into main caps. Valves: Competition Products stainless steel, 1.92 /1.66-in The concept car Pontiac Strato-Streak was used to introduce the V8 and in later years the engine was installed in Pontiac products. See Consumer Guide Automotive's New-Car Reviews, Prices, and Information. Whether all were installed in GTOs is unknown. Most Pontiac engines like total timing (rev engine past 3000 or so until the mechanical advance stops moving/advancing, vacuum advance disconnected to check total timing) somewhere between 32 and 36 degrees. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". [9], The W72 engine was standard in all 1977 Pontiac Can Ams (bar the 1977 Can Ams sold in California/High Altitude states which received the L80 Oldsmobile 403) and was optional in all 1977-79 Pontiac Firebird Formula and Trans Am models. 1967 - 400 Ram Air or 428 Code 670. In 1963 Pontiac dropped the Buick division built 215 cu. The last was the 421 HO and included a high-output camshaft and valve train. Pontiac differed from other GM Divisions and most other manufacturers in producing only a single small block V8, rather than adding a larger big block to its line-up. Optional power was the 421/356 with Tri-Power or the 421 HO putting out 376 horses with Tri-Power.
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