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john corcoran jr · 09-08-2021, 01:22 AM

1974 455 rated at 310 hp with 102cc combustion chamber.

1975 and 1976 455 rated at 300 hp in SS with 120 cc chamber.
Looks like piston to valve clearance shouldn't be a problem with flat top pistons.

09-08-2021, 01:22 AM	#65
john corcoran jr Junior Member Join Date: Oct 2003 Location: darien, il Posts: 53 Likes: 0 Liked 16 Times in 10 Posts	Re: Pontiacs 1974 455 rated at 310 hp with 102cc combustion chamber. 1975 and 1976 455 rated at 300 hp in SS with 120 cc chamber. Looks like piston to valve clearance shouldn't be a problem with flat top pistons.