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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. 1968 - 400 Ram Air I and 428HO Code 37" Ram Air I and. 18 watchers A Pontiac SD 421 came with forged steel rods and crankshafts for extra durability. 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. 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. 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. A higher-output version was offered, called the 326 HO (High Output). Only 157 Ram Air IV Firebirds, including 55 Trans Ams, were built for 1969. The 421 engine is available only with related heavy-duty driveline components. 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. 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). Total Timing: 36-deg BTDC Jim Taylor knows this, so he took a mathematical engineering-style approach to finding 100 hp in a relatively optimized engine. Read. Pontiac Engine Torque Specifications. The Pontiac 389 engine was produced from 1959 to 1966, and has a 4.06" bore and 3.75" stroke. Jim told HPP, "Since I was a young man in the '60s, I always thought how great it would be to find a true 100hp in a legendary 421 Tri-Power setup that retained its iron heads and intake. However, a few dealers would offer them in the GTO or Firebird and do their own installations, such as Royal Pontiac who offered the "Bobcat" conversion. Idel RPM Automatic In Drive Notes; 326: 1964: 45S: 0.035: . By 1963, the more powerful Pontiac 421 was beginning to outshine the 389 for performance applications. The 1971 455 HO was rated at 335hp (250kW) @ 4,800rpm and 480lbft (651Nm) of torque @ 3,200rpm (gross). Primary tube diameter: 1.75-in Get the best deals on Engines & Engine Parts for 1966 Pontiac GTO when you shop the largest online selection at eBay.com. Projects - 1964 PONTIAC 421 HO Engine Build | The H.A.M.B. The compression ratio will be 10.6:1. Splayed main caps, head bolts tie into main caps. 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. This is it! Along with being cheaper to build, this allowed more consistent valve action with less weight than a conventional shaft. All Pontiac V8s from 1955 to 1959 were reverse cooled, known as the "gusher" cooling system. In the early '60s, the engine program at the Pontiac division of General Motors was a wide-open operation that bustled with innovation. Pontiac offered this to the public as a streetable version of the 421 SD. Initial advance: 18-deg The overhead-cam six-cylinder engine was new for 1966 and the standard engine in the Tempest and Tempest Custom.