11. Chevrolet 454 V8
Chevrolet’s biggest engine was the 454 V8 they introduced in 1970. Chevrolet built it using the 427 V8 as a base, installing it in numerous cars, including the Corvette. When the 454 V8 debuted, the 427 V8 stayed in production, so Chevy had two big blocks to offer.
The 454 was factory-rated at 390 HP. However, for a limited time, Chevrolet offered a 450 HP LS6 version, which was the prime muscle car engine at the time. However, they took one more step beyond the LS6, and that was the LS7. It had a rating of 465 HP, but it was a limited-production item that later moved to the aftermarket crate engine segment. The original 454 V8 was in production until 1976, gradually losing power and torque due to tightening emissions standards. Chevrolet re-introduced the 454 in the late ’80s as their truck engine.