While that may seem like a major drawback, the two engines were intended to be used for very different things. The Pontiac 400 was a high performance muscle car engine. The Chevy 400, meanwhile ...

GM finally lifted its engine ban in 1970 ... and their cars deserve a shot in the modern performance age. The Ultra-Rare Pontiac 400 Ram Air IV Pontiac only produced the 400ci Ram Air IV V ...

Therefore, the Pontiac 400 was made as a high-performance muscle car engine, while the Chevy 400 was primarily used on pickup trucks.