The Pontiac 455 used a cast iron intake manifold as opposed to Chevy's 454, though, which were more refined and used aluminum. In its most powerful form, the Pontiac 455's factory compression ...

Topped with a dual-plane intake manifold ready to accept ... Featuring a cast-iron block and aluminum cylinder heads, the BluePrint 454 provides 460 horsepower and 479 lb-ft of torque.