Melling PN M54D with 60 psi spring, made 70 psi at 6,000 rpm with 30W oil When Robert Critchfield took over as general manager in 1952, he launched an ambitious plan to move Pontiac into the upscale, mid-range market occupied by Oldsmobile, and that demanded V8 power. Intake manifold: Original '64 PMD tri-power The SD-389 was limited to a single 4-barrel while the SD-421 used dual 4-barrels. For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. Fuel pump: Will use 110-gph Carter 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 428 was increased to 456.12cuin (7,474cc) in 1970. Engine options for the 1966 Pontiac Ventura were a 389 and 421 cubic inch 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. Head ID Location The heads were a new design featuring siamesed intake ports. 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). The valve angle was reduced from 17 degrees to 14 degrees for better breathing. Centerline: 110-deg 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. From a performance perspective, the 2+2 is pretty impressive. Under the leadership of chief engineers Pete Estes and John DeLorean, Pontiac engine guru Malcolm "Mac" McKellar (1920-2011) and crew developed the Super Duty 389 and 421 NASCAR engines that embarrassed the Fords and Chevrolets at Daytona. 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. Casting No. Manage Settings This was to ensure there was enough fuel to cool the cast offset dished pistons. Along with being cheaper to build, this allowed more consistent valve action with less weight than a conventional shaft. With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. This money bought a potent 389 V-8 with 267-283 bhp . Free local pickup. 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. Cam choice is always extremely important, and Jim decided to go with an aggressive Crower mechanical flat-tappet stick with 247/252-degrees duration at 0.050 and 0.515/0.525 lift (0.495/0.505 with 0.020 lash) with 1.6:1 rockers. It featured the "744" 301/313 camshaft, which offered more duration and overlap than the "HO". It was rated at 360hp @4300 RPM in the GTO and 370 @ 4600 RPM in the Grand Prix and other full-size Pontiacs. Two four-barrel carburetors, 10.5:1 compression, 285hp (213kW) @ 5100rpm, 330lbft (447Nm) @ 2600rpm. Valve guides: K-Line, liners 068) to 301/313 (No. Surprisingly, Mopar actually agreed and sent over several of the engineers that designed both the 392 and 426 Hemi. Like the 326, it was offered in both 2-barrel and 4-barrel versions. It would later become known colloquially as the "Ram Air III", though Pontiac never called it by that name. The 421 was first availabe in a SD (Super Duty) model that was built for racing. 544127 with larger 2.02/1.76-inch (51/45mm) valves entered production. Hewing to GM's standing edict limiting engine size to 400 cu in for its midsize and smaller cars, the 360hp (268kW) (underrated),[citation needed] the 400 cubic inch Ram Air V-8 was the most powerful and advanced option available in the 1967 GTO and Firebird. Example: A128 = January 12, 19*8. Forged rods and forged-aluminum pistons were specified, as were unique high-flow cylinder-heads. 1966 Pontiac Complete 389 Engine YC code 290 HP Block Catalina . Bearings: Sealed-Power mains and rods, cam Dura-Bond Ever wonder what it would take to increase that number by 100? A higher-output version was offered, called the 326 HO (High Output). Pontiac planned to produce the 1953 models with the V8, but Buick and Oldsmobile appealed to GM management and earned a 2-year delay. [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). Metallurgy of the critical parts is an area often overlooked, but not by Jim Taylor. All L78 Pontiac 400 equipped cars received the same shaker decal as the L80 Oldsmobile 403, being "6.6 LITRE". As a result, peak horsepower dropped from 310 to 290, though torque increased from 390 to 395lb. 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]. 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 "670" head was a 1967-only casting, and the only PMD head to have a closed chamber with the new 14 degree valve angle. 1969 - 400 Ram Air III or 350HO Code 48. The 421 SD Tri . 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. There were 11 different Pontiac V8 engine options for 1966, starting with the 326-cid 250-hp Tempest base V8. 301 2-barrel (135hp, 101kW), (5th character of the, 301 4-barrel (150hp, 112kW), (5th character of the. Pontiac engine production records report that 190 XS-code 389 engines were built during the 1966 model year. It was rated at 250hp (186kW) with 8.6:1 compression and 260hp (194kW) at 10.25:1 compression. The GTO's new hood scoop design, with the inlets centrally located and mounted above the carburetor, provided the opportunity for experimentation. 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. There was also the addition of dual exhaust, and for vehicles equipped with a manual transmission, a slightly more aggressive camshaft. $6.49 shipping. However, the 1959 389 engines had the generator in front of the heads with reverse flow cooling still in use. 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. 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 two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. 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. In addition to the inline 6, Pontiac used the Oakland V8 for one year, 1932, debuting the Pontiac straight-8 engine in 1933. 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. 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. Regarding Crower's upgrade suggestions for its . SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. It retained the 421's 4in (101.6mm) stroke and 3+14in (82.6mm) main journal. Valvesprings: Crower, dual no damper By 1949 work on a 287cuin (4.7L) OHV V8 had begun, but moved along slowly. Whether all were installed in GTOs is unknown. The 400 remained in production through the 1978 model year, with 1979 cars receiving engines produced the previous year. For 1965, however, the 2+2 became a bonafide muscle car. Learn how Classified Ads works . (imp.) According to GM mandates horsepower was now rated in net figures as opposed to gross, so on paper the 1972 455 HO appeared to have a significant drop in power, but in fact it was very much the same engine, and performance figures reveal this to be true. The 1972 455 HO was available in the Firebird (optional in Formula; standard in Trans Am) and 2-door LeMans (including those with the GTO option) and LeMans Sport convertible. 1965-75 Pontiac & Tempest engine tune-upspecifications including timing, dwell angle, and Spark Plug Gap, and firing order. Regarding Crower's upgrade suggestions for its camshaft, Jim pretty much has it covered. 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). I don't know if it can be done, but I'm going to try." 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. In 1970 the casting number #9799914 Ram Air 400 4-bolt main block also used the 4-bolt main caps on Ram Air applications. Pontiac produced the 421 V8 engine from 1961 to 1968. They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with the 421 H.O. 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). Timing chain: LPC, double rollerINDUCTION Collector size: 3.00-inGASKETS SELLER Glendale, Arizona 85305. 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). Also bowing in 1967 was the new Firebird, which had the . . 1967 - 400 Ram Air Code 97. Windage tray: Original PMD '70 455, fabricate fit, no bosses at cap #2 It was clear to most enthusiasts by 1966 that midsize models had seized the muscle car mantle. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. "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. Are you thinking of buying a 2007 muscle car, or any other car? In 1968, a 320hp (239kW) HO option was offered in the Tempest and Firebird. Final torque ratings may vary and need to be determined based on application and parts used. The development of this V8 dates back to 1946, when engineers began considering new engine designs for postwar cars. Length: 8.750-inCAM 1962 - 389 SD Code 544127. 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 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 : 1965-75Tune-up Specifications : Year: Engine Car Model: Spark Plug Type (AC) - Gap: Point Gap: Dwell Angle: . 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. Unfortunately, there were no improvements in the casting number "01" small-valve high-velocity heads, which would have yielded greater improvements in power. 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. In 1961 Pontiac continued to push the horsepower upwards with the release of the 421 engine. 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). 1966: 421: 9782611 (late) 1967-1969. Torque: See Part 2 1966: 421: 9782611 (late) 1967-1969. The Ram Air II also incorporated the first computer-designed camshaft. This was a completely stock car on loan from a private owner for the test. The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom. Returns; . 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.
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