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B1 originals fully ported, biggish cam, 572 CI, 15-1 compression, and hold on. If it's built right it should make 1000+ and go 4.60's-4.70's at sea level all day long at 7500 RPM.



Oh, I'm pretty sure 572-13's would get the same result if you talk to Todd Marsh. He's done some stout builds with them.