Introduced in 2001, the Vortec 8100 was one of the last evolutions of the Chevy big block engine. Vortec is the ... variants which were based on the 7.4-liter, '454' big block.

Chevy borrowed the 7.4-liter V8 from its heavy duty models and ... Under the hood, Chevy dropped in its massive 8.1-liter Vortec V8 thatmade 320 horsepower and 440 lb-ft of stump-pulling torque.