1966 pontiac 421 engine specsbest rock hunting in upper peninsula

The short deck engine weighed about 40lb (18kg) less than the other variants and had an 8000 rpm redline. Pre-Owned. 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). From a performance perspective, the 2+2 is pretty impressive. 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. In the 1968 Pontiac GTO it was given a 10.75:1 compression ratio and tuned to deliver 360 horsepower and 445 foot-pounds of torque.[2]. 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. Again, its bore was expanded, this time 0.03in (0.76mm) to 4.1525in (105.47mm). This was the beginning of factory supplied performance items such as 4 bolt main bearings and windage trays to reduce friction from crankcase oil. Two different cylinder-head castings were used for the 1962 model year, both with a combustion chamber volume of 68cc (4.15cuin) to produce an 11.0:1 compression ratio. The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. Based on the same short-deck as the 301, the "LS5" 265.1cuin (4.3L) was offered only in 1980 and 1981. They came up with a 269-cubic-inch (4.4L) L-head design. Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. designs, the SD-455 was a much improved engine. [2] This was the engine installed in the Pontiac Executive line of large cars[3] and its largest station wagon, the Pontiac Safari. 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. The "455 HO" moniker took on a whole new meaning with the introduction of the 1971 model year; Intended as a low compression progression from the previous years Ram Air IV engine, all 1971 455 HO engines used a heavy duty 4 bolt main block, round port cylinder heads (casting #197; with 8.4: compression), "Ram Air" style exhaust manifolds, and a two-part aluminum intake manifold. Idel RPM Automatic In Drive Notes; 326: 1964: 45S: 0.035: . See profiles, photos, and specifications of, Muscle cars came in many shapes and sizes. The 1969 HO 350 HO was equipped with the 400cuin (6.6L)'s large valve heads (# 48's) and the 400 HO camshaft and rated at 330hp (246kW). [11] By mid-1978, the W72 could no longer be ordered in conjunction with the MX1 3-speed Turbo-Hydramatic 350 automatic transmission, and could only be ordered with the 4-speed manual transmission. It was rated at 360hp @4300 RPM in the GTO and 370 @ 4600 RPM in the Grand Prix and other full-size Pontiacs. Calling into play enormous power and a decent 55/45 weight distribution, the 2+2 could be launched with little tire spin and guided through corners with alarming efficiency. Engine Specifications. 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. A limited-slip differential and gearing up to 4:11.1 were optional. The 389 was the standard engine on the GTO up to 1966. Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. 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. 1967 - 400 Ram Air or 428 Code 670. This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421 . Setting initial timing at idle with the vacuum advance disconnected will usually fall around 12 to 16 degrees, but that's not really important. Prices ranged from $2,760 to $3,220 . The 428 was factory installed in large cars only. Specifications listing with the performance factory . An innovative design feature was mounting the rocker arms on ball pivots on studs set into the cylinder head, rather than using a separate rocker shaft. 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. 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. The initial press cars that were given to the various enthusiast magazines (e.g. 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. On premium fuel, it was rated at 207 hp at 5200 rpm and . 1966 Pontiac Catalina The engines feature a cast-iron block and head and two valves per cylinder. / 8.3 mpg (U.S.) / 3.6 km/l, more data: 1966 Pontiac Catalina 2 . 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. 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. The Ram Air IV replaced the Ram Air II in 1969. Two-barrel carburetor, 8.5:1 compression, 227hp (169kW) @ 4600rpm, 333lbft (451Nm) @ 2300rpm, Four-barrel carburetor, 10:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Two-barrel carburetor, 10.0:1 compression, 244hp (182kW) @ 4800rpm, 350lbft (475Nm) @ 2600rpm, Four-barrel carburetor, 10.25:1 compression, 270hp (201kW) @ 4800rpm, 359lbft (487Nm) @ 2900rpm. These muscle car profiles include photos and specifications for each model: For related car information, go to these articles: Please copy/paste the following text to properly cite this HowStuffWorks.com article: the Auto Editors of Consumer Guide 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." 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. . Final torque ratings may vary and need to be determined based on application and parts used. After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400cuin (6.6L). 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). With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. Engine Oil: 120 ft-lbs. 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. For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. Engine displacement is a function of bore and stroke. Approximately 6,000 2+2's were built in 1966, the only year the 2+2 was its own model. Pontiac did not release official power ratings for this engine, saying only that it had more than 300hp (224kW). Likewise, the top 428 carried the same 376-hp rating as the 1966 Pontiac 421 Tri-Power motor. 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. 3.75. Here are my top six rationales for admiring the 1966 GP. Regarding Crower's upgrade suggestions for its . A Pontiac SD 421 came with forged steel rods and crankshafts for extra durability. The W72 offered many improvements over the standard L78 400 Pontiac. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. 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. 1966 yk 421 376 a 3x2 1967 zg 230 165 a 1 1967 zm 230 165 a 1 1967 zk 230 165 3 m 1 1967 zs 230 165 3 m 1 . It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. Detroit, however, was reluctant to relinquish its time-tested biggest-car/best-engine formula. 068) to 301/313 (No. Head ID Location 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. Head mods: Port, cook, magnaflux, glass bead, convert to screw-in studs 421 CID V8 - 4BBL - Automatic - P.S. 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. 1969 - 400 Ram Air III or 350HO Code 48. Pontiac V8 Engine Tune-Up and Torque Specifications. Collector size: 3.00-inGASKETS A total of 1,808 Ram Air IV production cars were built over its 2-year production. A mechanical system built by Rochester, it was similar in principle, but not identical, to the contemporary Chevrolet "fuelie". Brand: Crower PN 60311, solid A mere five were built, all with a four-speed transmission. From 1955 through 1959, the Pontiac V8 was also used in some GMC pick-up trucks. Pontiac engine production records report that 190 XS-code 389 engines were built during the 1966 model year. The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. 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]. The last "true" Pontiac V8s, a 265 and 301cuin (4.3 and 4.9L), ended production in early 1981. Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 Year: CU IN: Casting # 1967: 326. . 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. of torque at 3,600 RPM in the Firebird, with only a small throttle restrictor tab on the Firebird being different. 1966 Engine Codes ; Code: Application: Displacement: Compression: Horsepower: Transmission: Heads: Camshaft: Carb: WA : 389: 8.6:1: 256: Manual: 91: 254: 2 bbl: WB . 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). Type Size Carb Horse Power Tourqe; Tri-Power: 389ci: 3x2bbl: 360 hp @ 5200 rpm: 424 lb-ft @ 3600 rpm: Base 8 . Here are features on more than 100, Muscle cars created their own culture. 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). Valve lift stayed at just over 0.400-inch with 1.5:1-ratio rocker arms. By comparison, the factory 421 H.O. SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. Pontiac listed the 290hp (216kW) rating at 4000 rpm for a motor that had a 5700rpm redline on the factory tachometer. 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. Other dimensional factors such as the wheel base, curb weight and length were largely unchanged. CO2, . Shipping to: 98837. From 1959 to 1966 Pontiac continues making improvements. 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. Primary tube diameter: 1.75-in These are general guidelines. Brand: Fel-Pro head and intake/ SCE pan and timing cover 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. 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. Mechanical advance: 36-deg at 3,200 rpm The 2-barrel version was last offered in 1979. He thinks the stock exhaust flow of 180 cfm will suffice for this build. in., again available only in the GTO and Firebird. which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. 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). Valvesprings: Crower, dual no damper Pontiac V8 Engine Tune Up Specifications. Rod bolts or studs/head bolts or studs: ARP cap screw supplied in Howard's rods / PMDOILING SYSTEM It featured the "744" 301/313 camshaft, which offered more duration and overlap than the "HO". 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. Compression Ratio: 10.6:1 effective The results showed Pontiac that an L-head simply couldn't compete with an overhead valve engine. The 2+2 package was first offered as a $291 option on Catalina hardtops and convertibles in 1964. The 400 remained in production through the 1978 model year, with 1979 cars receiving engines produced the previous year. The Pontiac 421 HO was the king of the streets in 1963, producing 353 and 370 horsepower depending on carburetor configuration. All L78 Pontiac 400 equipped cars received the same shaker decal as the L80 Oldsmobile 403, being "6.6 LITRE". Despite their work, the division's conservative management saw no immediate need to replace the Pontiac Straight-8 until later in the 1950s. The 421SD was available in 1961 as a dealer option or over the counter then in 62 and 63 from the factory, and was fitted with a list of internal modifications designed solely to withstand the abuse of drag racing. As a result, peak horsepower dropped from 310 to 290, though torque increased from 390 to 395lb. Jets, Primary: Center #64 adjust power valvespring for 12 Hg at 1,000 rpm The Ram Air IV used the Ram Air II's camshaft but lift in the Ram Air IV was increased to 0.52in (13mm) thanks to the use of 1.65 ratio rocker arms (vs 1.50). These heads can be distinguished from 6x8 heads through a small stamped "4" on the top of the front boss. 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. like the earlier 1971-1972 motor, but it was not the same motor, and featured standard d-port heads with a very conservative camshaft. 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 horsepower ratings of this era were often dubious, with engines rated higher or lower in output for advertising, political, or insurance purposes. The 1981 301 Turbo gained the electronic controls with an O2 sensor, feedback ECM and E4ME Quadrajet providing a slight reduction in output to 205hp (153kW) and 340lbft (461Nm).The 301 Turbo was limited to Trans Am and Formula Firebird production only. A three-speed stick was standard; a four-speed and automatic cost extra. Intake manifold: Original '64 PMD tri-power It featured 3+14in (82.6mm) main journals (which the legendary Smokey Yunick reputedly left Pontiac's engineering department over). Along with a cam swap it boosted horsepower from 325 hp with the four-barrel carb to 348 hp in '64. 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. 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). In 1973 Pontiac started stamping extra numbers (1/4" tall) on their heads.These head numbers represented chamber sizes.They are usually stamped on the machined pads by the valve covers. Save pontiac 421 complete engine to get e-mail alerts and updates on your eBay Feed. 1. 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. 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. For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. In 1963 Pontiac dropped the Buick division built 215 cu. Still, it was the strongest American engine offered that year. Vacuum advance: Not usedEXHAUST This same camshaft was also used in Pontiac's 19691970 RA IV production cars. The 1958 370" engine and the 195960 389 version was named the "Tempest" V-8 and changed in 61 to the "Trophy" V8. For the truly obsessed, 16 Grand Prixs were built with Pontiac's 421 Super Duty engines, rated at a staggering 370 bhp. The Pontiac 2+2 is a full size automobile that was manufactured by Pontiac, built on the B-body chassis.It debuted for the 1964 model year as a trim-only option for the Pontiac Catalina, with special door panels, bucket seats with a center console, and exterior badging.Pontiac marketed the 2+2 as the "big brother" to the popular Pontiac GTO.. Beginning in 1965 the name Catalina was no longer . Block description: '64 421ci #157 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. Information and specs for the Pontiac 421 V8 engine. Engine Oil: 95 ft-lbs. It used the "744" camshaft (301-313) in the earlier manual trans versions, later downgraded to the "068" version, and the 288/302 duration cam with automatic transmission. Horsepower: See Part 2 With A/C On, Engine Hot: 421: 1966: With Tri-Carb, With Air Injection reactor: 45S: 0.035: Learn how Classified Ads works . We and our partners use cookies to Store and/or access information on a device. Both used a single two-barrel carburetor. This resulted in a lightweight design weighing less than the Chevrolet small-block V-8. Most Pontiac engines were painted light blue. This engine was first offered in 1967 as the top engine option in full-size Pontiacs. 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. Model Number: Body/Style Number: Body Type & Seating: Factory Price: . 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. These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. 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. The 421 engine is available only with related heavy-duty driveline components. The concept car Pontiac Strato-Streak was used to introduce the V8 and in later years the engine was installed in Pontiac products. Pontiac offered Tri-Power on select models and engines (347, 370, 389, and 421 CID) from 1957 through 1966, when it was finally . 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). For 1969-1970 GTO the 400 HO included driver operable Ram Air induction and was renamed "400 Ram Air" for 1969 and just "Ram Air" for 1970. This camshaft sported a 308-/320-degree duration with 0.47-inch (12mm) lift. 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]. [4] It was replaced by the 455 for the 1970 model year. 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.

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