1966 pontiac 421 engine specs 1966 pontiac 421 engine specs

Power ratings increased accordingly: Several dealer-installed camshafts were optional to increase power further to 317hp (236kW). Also added was the #48 casting number heads with a 68cc (4.15cuin) chamber for higher compression, along with larger 2.11 and 1.77in (54 and 45mm) valves. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Chamber: Closed, special to PMD, 70 cc Free-flowing exhaust manifolds from the 400 Ram Air were used late in the model year. Dry weight ranged from 590 to 650 pounds (270 to 290kg), depending on displacement and year. Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. The beginnings of Pontiac's iconic Ram Air dynasty began during the 1965 model year. Seat pressure: 110 pounds at 1.600-in Bearings: Sealed-Power mains and rods, cam Dura-Bond in., again available only in the GTO and Firebird. 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. Melling PN M54D with 60 psi spring, made 70 psi at 6,000 rpm with 30W oil This resulted in a lightweight design weighing less than the Chevrolet small-block V-8. Information and specs for the Pontiac 421 V8 engine. The Pontiac 301 EC (Electronic Controls) version offered in 1981 produced 155hp (116kW) and 245lbft (332Nm), although it's rumoured that the actual output was closer to 170hp (127kW). Timing chain: LPC, double rollerINDUCTION Still, it was the strongest American engine offered that year. The W72 was only available for a very short time, with the majority of 1979 model year W72 Firebirds ordered in late 1978. The 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. The Fresh Air package continued into the 1966 model year. The 421 also marked the end of the option for a forged-steel crankshaft. Released in 1961, the 421 was a bored and stroked 389 which sported a bore of 4.094 and a stroke of 4.00. Idel RPM Automatic In Drive Notes; 326: 1964: 45S: 0.035: . The 428 was factory installed in large cars only. . Price $15500.00. The Armasteel cast crankshaft was the standard hardened cast-iron crankshaft used throughout the entire Pontiac V-8 line until 1967. Beginning in 1961 the Pontiac V-8 (389 and 421) was dubbed the Trophy V-8, due to its many victories in racing. Head mods: Port, cook, magnaflux, glass bead, convert to screw-in studs For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. 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 . This engine was first offered in 1967 as the top engine option in full-size Pontiacs. Car and Driver magazine, which had showcased the infamous Pontiac GTO vs. Ferrari's GTO comparison in 1964, organized another bout between the . A period-correct battery cranks the high-compression 469-cubic-inch Pontiac engine. [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. Cougar pulled out of Mustang's shadow with the striped and spoilered 1969 Mercury Cougar Eliminator. Three two-barrel carburetors, 10.75:1 compression, 290hp (216kW) @ 5000rpm, 375lbft (508Nm) @ 2800rpm. Displacement (CID) Bore (Inches) Stroke (Inches) Mains (Inches) 1955. He wanted to confirm his parts are up to the task of holding the cylinder pressure that creates horsepower. To learn about it, read. 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]. It was rated at 310hp (231kW) @ 4800rpm and 400lbft (542Nm) @ 3,000rpm on 10.5:1 compression. [4] It was replaced by the 455 for the 1970 model year. This was a project started with the end goal of building a 427 Hemi. From a performance perspective, the 2+2 is pretty impressive. 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]. Coil: GM The most famous S/D of them all. Only about 400 were produced before the fuel injection system was quietly dropped. 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. 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. According to the June 2019 issue of Muscle car Review magazine, during dyno testing performed during that era, the National Hot Rod Association (NHRA) rated this Pontiac W72 400 T/A 6.6 engine at 260 to 280 net horsepower instead of the 220-hp rating published by Pontiac. 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. The most valuable Pontiac GTO is the 1969 Judge convertible with the 370-hp Ram Air IV engine. The other major difference between the "typical" Pontiac engine of the time was that this one used the large . 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. 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. The 455 was fundamentally the same for the 1976 model year, albeit the shaker decal now just read "455". 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. Crank: Original '64 421 A total of 1,808 Ram Air IV production cars were built over its 2-year production. Engine, horsepower, torque, dimensions and mechanical details for the 1966 Pontiac Catalina. 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. A mere five were built, all with a four-speed transmission. 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. Given that, it was no accident that the leader in intermediate muscle also put together the finest full-size performance machine -- the 1966 Pontiac 2+2. Both Randy and Stan were aware of the . Power output ranged from 135hp (101kW) to 170hp (127kW). [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. The Ram Air IV replaced the Ram Air II in 1969. Unfortunately, that's what happened with the 1963 Pontiac Super Duty 421. Rod/Stroke ratio: 1.65:1BOTTOM END 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). The engines feature a cast-iron block and head and two valves per cylinder. These are general guidelines. Preparation: Cook, bead blast, magnaflux, bore, true decks, align bore 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). . The 2+2 reverted to option status for '67, then died, a proud relic of a time when big cars, Pontiacs in particular, ruled the streets. It could only be ordered with a TH200 automatic transmission and a 2bbl configuration. Distributor: '61 Delco cast-iron with direct oiling 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. 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. All Pontiac Catalina 2-Door Sedan versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . 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. By 1963 Pontiac decided it was time to 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. It is a known fact that a person's pupils dilate slightly when viewing something pleasant to the eyes. For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. The engine was available in all full-size Pontiacs. They came up with a 269-cubic-inch (4.4L) L-head design. However, in the June 1974 issue of SUPER STOCK AND DRAG ILLUSTRATED, a new 1974 Trans Am with the SD-455 motor ran 14.25 @ 101mph (163km/h). The Pontiac V8 engine is a family of overhead valve 90 V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. 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. 421 CID V8 - 4BBL - Automatic - P.S. They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with the 421 H.O. Both used a single two-barrel carburetor. Both engines received the McKellar number-10 camshaft, which was much like a solid-lifter version of the hydraulic number-041 of later years. Here are features on more than 100, Muscle cars created their own culture. High output Pontiac V8 Cylinder Heads. Engine Specifications. 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. (V8) - Stamped on right front side of block or beneath production . The engine came with 543797 (4-barrel) and 9770716 heads for the tri-power and special exhaust manifolds and a 7H cam with 292deg. 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. Preparation: Wash after balance for assembly The 301 Turbo package mandated air conditioning, the THM350 (sometimes referred to as the CBC350 in various literature) non-lockup automatic transmission (THM350C lockup in 1981 Trans Ams), and 3.08 rear axle gearing. Initial advance: 18-deg Tri-power engine rated at 376 hp. Mods: Built to factory specifications/ adapt '64 choke to '66 center carburetor which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. Apparently at least one of these engines survives under the hood of an engineer's personal Pontiac. ][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. Beep, beep! Mods: Flow-test indicated '66 center carburetor would be required to improve total cfm, adapter made to fit '66 center carburetorIGNITION It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. Pontiac Engine Torque Specifications. or Best Offer. 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. The consent submitted will only be used for data processing originating from this website. The mighty Pontiac 421 was a star on the drag strip and a super nova on the Nascar tracks of the first half of the 60s. 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. 3.75. The single four barrel was rated at 333 bhp while the Tri-Power version carried a 348 bhp rating. Bolts or Parts: Lube or Sealer: Torque to: Main Caps. Well, gaze upon these numbersa 421ci Pontiac with Tri-Power carburetion. All Pontiac V8s from 1955 to 1959 were reverse cooled, known as the "gusher" cooling system. Instead, they were substituted with the L80 Oldsmobile 403, or the L37 Pontiac 301 if they still requested a 4-speed transmission. 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. Super Duty 421s were back, tougher than ever. Year: CU IN: Casting # 1967: 326. The engine build will be discussed in two parts. 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. aluminum V8 it had offered in the Tempest and replaced it with a small-bore version of the standard 389cuin (6.4L) Pontiac V8. This was to ensure there was enough fuel to cool the cast offset dished pistons. Since the story of this 421 is better told in pictures, follow along as we take you on this exciting journey! The 428 was increased to 456.12cuin (7,474cc) in 1970. Original plans called for a forged crankshaft, although actual production SD455s received nodular-iron crankshafts with minor enhancements. The 389 V8 was first introduced by Pontiac in 1959. 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. More 400cuin (6.6L) engines were produced by Pontiac than the other versions - estimates range from 80 to 200 units. Its cast "670" heads had taller valve spring heights than the standard D-port heads, and the only 14-degree valve angle closed combustion chamber making these heads unique. Stating in 1962 the "421" and the "421 SD" engine became available as a factory option until 1966. The 2-barrel version was last offered in 1979. 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. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". The four-barrel version with 10.5:1 compression upped horsepower to a healthy 285. . The last was the 421 HO and included a high-output camshaft and valve train. This was underrated at 330hp (246kW). Free local pickup. designs, the SD-455 was a much improved engine. Transistorized ignition was available. Sponsored Stories . 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. 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. 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. But the "Ram Air" 400 also mandated steep 4.33:1 gears(or 3.90:1 in Firebird), making the Quadra-Power 400 (400 HO) the top practical street engine option for most drivers. Primary tube diameter: 1.75-in This was based on results of over 1 million test miles, which was unheard of at the time. Pushrods: LPC chrome moly - P.Top - Correct Exterior/Interior. 1969 - 400 Ram Air III or 350HO Code 48. 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]. Only about 2000 like this one were built with 4 speed Muncie transmissions. 744) and a new valve spring package with dampers to positively control valve action. Deck Height: 10.215-in Engine Year Info Spark Plug Plug Gap Point Gap Dwell Angle Timing (BTDC) Idel RPM Manual Tran. Setting initial timing at idle with the vacuum advance disconnected will usually fall around 12 to 16 degrees, but that's not really important. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. The V8 engine was introduced for the 1955 model year as the "Strato Streak". It also could hold its own against a range of performance cars. Angles used in valve job: 30-deg intake, 45-deg exhaust seat, width 0.040-in intake, 0.060-in exhaust Based in part on designs for the "short deck" 303cuin (5.0L) engine designed for the 1970 racing season, it had a shorter deck than the big V8, and used thin-wall castings to reduce weight. The Pontiac 2+2 was promoted as the "big brother" to the iconic Pontiac GTO. A Pontiac SD 421 came with forged steel rods and crankshafts for extra durability. The 421 SD Tri . Special Offer on Antivirus Software From HowStuffWorks and TotalAV Security. . Engine Block Date Code. 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. Forged steel 6.625in (168.3mm) rods (Ram Air V style), Large-valve heads (valve diameter): 2.4in (61mm) intake, 2in (51mm) exhaust, Small-valve high-RPM head (valve diameter) 2.19in (56mm) intake, 2in (51mm) exhaust. Mods: Intake port match, valve bowl blend, improved short-turn radius Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. For 1965, however, the 2+2 became a bonafide muscle car. Though airflow is paramount in making power, there are other aspects of the engine that are just as important. It was implemented as further development of a cost-effective, more fuel efficient V8 derivative of the 301 V8 for the CAFE requirements. This money bought a potent 389 V-8 with 267-283 bhp . V-8 (coded WG for stick or YH for auto) was the 2+2's base engine. The camshaft was also revised to have a slightly higher duration, the carburettor jets tuned and a dual exhaust was implemented allowing the power to increase to 220hp (223PS; 164kW) at 4000 rpm and 320lbft (434Nm) of torque at 2800 rpm.