HP gain of 10.5-1 pistons vs 8.8-1 in a 273.

66fs said

A friend of mine just dyno'd a .030 273 with factory intake, Isky E-4, 2 barrel pistons, 920 heads, .039 large bore Fel-Pro gaskets, Edelbrock carb and headers. 266 HP

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That's what we like to hear.If I ever pull mine out I will dyno it just for fun. Then my first Desktop dyno run would be pretty close. I set it up with manifolds and it made 255 hp. Headers should add 10 hp or so. The Desktop Dyno is very close again.