The 455 HO package was only available to late model year Pontiac Firebird Trans Am's, and was mandatory with a 4-speed transmission. This was to ensure there was enough fuel to cool the cast offset dished pistons. From 1959 to 1966 Pontiac continues making improvements. Coil: GM 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). Well, gaze upon these numbersa 421ci Pontiac with Tri-Power carburetion. 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. 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. Nevertheless, there appears in the October 72 issue of MOTOR TREND, a road test of a 1973 SD-455 Grand Am. The "670" head was a 1967-only casting, and the only PMD head to have a closed chamber with the new 14 degree valve angle. Jim Taylor knows this, so he took a mathematical engineering-style approach to finding 100 hp in a relatively optimized engine. superior_queens (3,035) 100%. In 1967, the cylinder head design was improved for the 400 4-barrel engine. A higher-output four-barrel carburetor version was offered, called the 326 HO (High Output). Pontiac offered Tri-Power on select models and engines (347, 370, 389, and 421 CID) from 1957 through 1966, when it was finally . The very modest cam, combined with a low-compression ratio of 8.4 (advertised) and 7.9:1 actual resulted in 290hp (216kW) SAE NET. On premium fuel, it was rated at 207 hp at 5200 rpm and . 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. 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. In 1974 it was used in the GTO and was rated at 200hp (149kW) (net). The 421 used the same 4.120-inch bore but used the 4.0-inch crank from the 421 it replaced. 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). 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. 1965 Pontiac LeMans GTO Mecum. Note the tri-color Pontiac Ventura upholstery. 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). Here are my top six rationales for admiring the 1966 GP. All 428 cylinder heads received the 14 degree valve angle, closed chamber only in 67 and open chamber 68 and up. . The engines feature a cast-iron block and head and two valves per cylinder. Along with being cheaper to build, this allowed more consistent valve action with less weight than a conventional shaft. Casting number: 97770716, '64 date The four-barrel version with 10.5:1 compression upped horsepower to a healthy 285. . The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. The concept car Pontiac Strato-Streak was used to introduce the V8 and in later years the engine was installed in Pontiac products. These guys lived by mathematics since every function of an engine that converts chemical to mechanical energy can be assigned a number. Centerline: 110-deg Compression Ratio: 10.6:1 effective Along with proper parts selection, accurate machining and assembly are also important It retained the 421's 4in (101.6mm) stroke and 3+14in (82.6mm) main journal. Located at the back of the engine near the Distributor. Email Email. Fuel line size: 38-inch, 516-inch to carburetor Year: CU IN: Casting # 1967: 326. Beginning in 1961 the Pontiac V-8 (389 and 421) was dubbed the Trophy V-8, due to its many victories in racing. The 1966 Pontiac Ventura doesn't necessarily come up when speaking of 60's muscle cars, but the type of V-8's offered with the Ventura meant plenty of power. There was also the addition of dual exhaust, and for vehicles equipped with a manual transmission, a slightly more aggressive camshaft. Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. High output Pontiac V8 Cylinder Heads. 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. 1975 Factory Service Manual lists the SD-455, but the SD-455 did not meet emissions for the 1975 model year and was canceled. 1. 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. The next 1 or 2 numbers represent the date, and the last number is the year. [4] It was replaced by the 455 for the 1970 model year. The V8 engine was introduced for the 1955 model year as the "Strato Streak". 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. Displacement (CID) Bore (Inches) Stroke (Inches) Mains (Inches) 1955. 1966 Pontiac Catalina technical specifications and data. For the first time, Pontiac offered Tri-Power, three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). NASCAR race cars embody the muscle car philosophy of power. Example: A128 = January 12, 19*8. Lobe separation angle: 112-deg 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. 1966 Pontiac Catalina . 1963 - 389 SD Code 543797. Bore/Stroke: 4.150/4.00-in 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. 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. A mere five were built, all with a four-speed transmission. Get the best deals on Engines & Engine Parts for 1966 Pontiac GTO when you shop the largest online selection at eBay.com. 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. 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. 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. Crank: Original '64 421 ft. After the SD-455 was certified with the new cam, it was production-ready but was then further delayed by the EPA mandating Pontiac recertify all of its engines when the EPA discovered that part-throttle emissions exceeded the limits. View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. A Pontiac SD 421 came with forged steel rods and crankshafts for extra durability. It featured a smaller bore of 3+34in (95.3mm) coupled with the same 3in (76.2mm) stroke of the 301 (same bore and stroke used by Chevrolet when the first small block motor was introduced in 1955). First offered as an option in 1963, the 421 HO came in a 4-barrel engine of 320hp (239kW) and one Tri-Power H-O version with a hotter cam and efficient iron exhaust manifolds and rated at 370hp (276kW). The initial press cars that were given to the various enthusiast magazines (e.g. Effectively, Pontiac's V8s were all small blocks, sharing the same connecting rod length 6.625 in (168.3mm) (except for the later short deck 301 and 265 produced in the late 1970s and early 1980s before Pontiac adopted universal GM engines). Block casting # 9773157. Pontiac engine production records report that 190 XS-code 389 engines were built during the 1966 model year. Beep, beep! Pontiac began as a "companion make" to the Oakland division of the General Motors line of automobiles in 1926. 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. Wires: NAPA Belden 7 mm Ever wonder what it would take to increase that number by 100? For 1974 another 1,001 (943 Trans Am, 58 Formula) were built, after which the SD-455 was discontinued. It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. 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. Fuel pump: Will use 110-gph Carter 1962 - 389 SD Code 544127. Open pressure: 282 pounds at 1.100-in 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 stroke increased to 4.21-inch (106.9mm). The inlets were all well within the boundary layer that exists close to the surface, so all of these systems would more accurately be described as "outside air induction" systems, benefiting from the intake of cooler, and thus denser, outside air versus the comparatively hotter and less dense air under the car's hood. The engine build will be discussed in two parts. gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS ( SAE gross . Pontiac continued using its round-port cylinder-head design for 1971-'72 on the 455 HO. Federal emissions standards and the drive towards "corporate" engines shared among all GM divisions led to the progressive demise of the Pontiac V8 through the late 1970s. Timing chain: LPC, double rollerINDUCTION . He thinks the stock exhaust flow of 180 cfm will suffice for this build. Valve guides: K-Line, liners Engine options for the 1966 Pontiac Ventura were a 389 and 421 cubic inch V-8. "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. The crankshaft in the 428 had a "N" cast on them (designating nodular steel) as opposed to the 421's Armasteel. Metallurgy of the critical parts is an area often overlooked, but not by Jim Taylor. 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. intake duration and later 1964 L with 288deg intake essentially the same as the 068 cam. All Pontiac Catalina 2-Door Sedan versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . 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. The beginnings of Pontiac's iconic Ram Air dynasty began during the 1965 model year. The 421 SD produced up . All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . Offered from 1967 to 1969, it produced 360 and 376hp (268 and 280kW) in 1967, 375 and 390hp (280 and 291kW) in 1968 and 360,370 and 390hp (268,276 and 291kW) in 1969. Available only in the 1973 and 1974 Firebird Formula and Trans Am, the SD-455 consisted of a strengthened cylinder block that included 4-bolt main bearings and additional material in various locations for improved strength. It also sports the four-speed manual, limited . Pontiac's initial plans were to use a camshaft with specs identical to the 041 Ram Air IV camshaft, but testing showed emissions, while technically compliant, did not have "cushion" to satisfy Pontiac's emissions engineers, to avoid production variation leading to any non-compliant engines being produced and sold. It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. Pontiac RAIII/IV Engine parts collection Price $14000.00. 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. Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. The single four barrel was rated at 333 bhp while the Tri-Power version carried a 348 bhp rating. [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. As with all other Pontiac V8 motors that evolved from the 316 V8, the 421 was simply a bored out and stroked version of the popular Pontiac 389 V8. The manuals had Hurst shifters. Mods: Flow-test indicated '66 center carburetor would be required to improve total cfm, adapter made to fit '66 center carburetorIGNITION All Rights Reserved. They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with 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. The GTO came with a four-barrel 389 V8 with 335 horsepower. This new material had stronger alloys in the iron. Specifications listing with the performance factory . The 1970 '455 HO' was a conventional "D" port engine. The 1980 301 Turbo was rated at 210hp (157kW) at 4400rpm and 345lbft (468Nm) @ 2800rpm. 1966 Pontiac Ventura Specifications. 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? On this Wikipedia the language links are at the top of the page across from the article title. like the earlier 1971-1972 motor, but it was not the same motor, and featured standard d-port heads with a very conservative camshaft. Apparently at least one of these engines survives under the hood of an engineer's personal Pontiac. 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 air cleaners look like those used on the top dog 376 gross HP 421 CI engine but there was also a lesser 356 HP version available too. 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). 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. 455 (7.5) Buick Gran Sport, and 455 (7.5) Oldsmobile 442). It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. 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. Secondary: Front and rear #70 and so the 326 bore size was reduced to 3.72in (94.5mm), giving a true 326.06cuin (5.3L). 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 Pontiac Catalina In basic 2-barrel form it produced 290 horsepower and 428ft. pounds of torque in 1968. Approximately 6,000 2+2's were built in 1966, the only year the 2+2 was its own model. In 1963 Pontiac dropped the Buick division built 215 cu. 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. 1968 - 400 Ram Air I and 428HO Code 37" Ram Air I and. For 1958 the V8's bore was increased again to 4+116in (103.2mm), increasing displacement to 369.4cuin (6.1L). Vacuum advance: Not usedEXHAUST Kits for Pontiac applications. There are no manual transmission equipped Trans Ams that came factory with the standard L78 400 motor in 1977-79. The Pontiac 389 engine was produced from 1959 to 1966, and has a 4.06" bore and 3.75" stroke. Lifters: Crower solid with EDM oil hole (0.024 inch) Pistons: Icon PN IC892 application 428 +0.030-in with 10cc dish - P.B. Despite their work, the division's conservative management saw no immediate need to replace the Pontiac Straight-8 until later in the 1950s. However, the 1959 389 engines had the generator in front of the heads with reverse flow cooling still in use. After the 1974 SD455 was dropped the 1975 Firebird's top performance engine was an 'L78' Pontiac 400cuin (6.6L). These heads can be distinguished from 6x8 heads through a small stamped "4" on the top of the front boss. This engine was first offered in 1967 as the top engine option in full-size Pontiacs. With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. Pontiac successfully competed against more-expensive inline four-cylinder models with their inline flathead six-cylinder engines. [citation needed]. [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. At the end of 1976, Pontiac was no longer able to continue production of the 455 (7.5 L) V8 motor due to the tightening emissions requirements. It included a new camshaft with duration increased from 288/302 (No. gasoline (petrol) engine with displacement: 6902 cm3 / 421.2 cui, advertised power: 252 kW / 338 hp / 343 PS . Two tri-power 421s were optional, one with 356 bhp, the other with 376. Price $30000.00. [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. 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 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. Pontiac V8 Engine Tune-Up and Torque Specifications. 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. The 455 was fundamentally the same for the 1976 model year, albeit the shaker decal now just read "455". Engine Oil: 120 ft-lbs. 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. The 400 HO was offered as an option for 1967-1970 for GTO and 1968-1970 for Firebird. #9770716 aka "716" heads featured a 170cc intake port volume, and were considered a milder "street" version of the vaunted SD421 Super Duty heads. It featured the "744" 301/313 camshaft, which offered more duration and overlap than the "HO". Instead, they were substituted with the L80 Oldsmobile 403, or the L37 Pontiac 301 if they still requested a 4-speed transmission. 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). This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421 . or choose Generic to see kits that might fit a . 744) and a new valve spring package with dampers to positively control valve action. 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 421 was first availabe in a SD (Super Duty) model that was built for racing. Maximum flow at 28 inches of water It featured 3+14in (82.6mm) main journals (which the legendary Smokey Yunick reputedly left Pontiac's engineering department over). Contemporary road tests suggest that it was actually somewhat inferior to the Tri-Power engines, although it did have better fuel economy. As a result, it was remarkably free of teething problems. 1966: 421: 9782611 (late) 1967-1969. Only 630 Bonnevilles were produced for 1957, all of them fuel-injected. This camshaft sported a 308-/320-degree duration with 0.47-inch (12mm) lift. "1966 Pontiac 2+2" Regarding Crower's upgrade suggestions for its . The short-deck block and different intake ports also required the design of a new intake manifold. The engine came with 543797 (4-barrel) and 9770716 heads for the tri-power and special exhaust manifolds and a 7H cam with 292deg. Price $14000.00. Total Timing: 36-deg BTDC said the "Pontiac 421 cu. / 8.3 mpg (U.S.) / 3.5 km/l, more data: 1966 Pontiac Bonneville Convertible . Only one is known to survive today. 1966: 421: 9782611 (late) 1967-1969. 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. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. 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). The heads were a new design featuring siamesed intake ports. Math, not gasoline, makes horsepower under the hood of a Pontiac. 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). Casting No. 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. 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. 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. 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. 3.75. 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. There were 11 different Pontiac V8 engine options for 1966, starting with the 326-cid 250-hp Tempest base V8. 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.
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