![]() Despite this, the engine remains extremely powerful and reliable, and it can be improved to achieve even greater performance levels. Most car enthusiasts have never heard of the small engine in the Pontiac 350. It will take a long time to run 650 HP with the cast crank. If you are replacing cast rods, you should go for forged ones. The 400 has a more powerful engine, but with a smaller bore and a less powerful motor. It was powered by the big valve heads from the GTO and rated at 330 HP in 1968, with HO versions appearing from 1969 to 1973. In 1970, the Pontiac 350 was powered by a two-barrel engine with an HP rating of 250 and CR of 7.8:1 in the two-barrel configuration. The 1968 Pontiac Firebird 350-cid HO V-8 engine, with a high- performance camshaft, better exhaust gas scavenging, and revised carburetion, had more power than the previous year’s 327-cid engine, producing 320 horsepower and 35 more pounds per square foot.
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