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Very interesting, a set of ported 351 windsor heads with stock valve size (1.84 and 1.54) produced the most torque (374 ft/lbs) for my engine setup according to performance trends engine analyzer. I think it may be the combination of smaller port CCs (155) and smaller intake valve which produce excellant flow and flow velocity at 4500 RPM (torque max). By the way, the engine is a '68 302 with Crane roller cam (281, 0.512), headers, manifold, etc. The horsepower computed (354 hp) was not as high as some other setups with heads having larger ports and valves, but the difference was only about 10-15 hp. My question is...doesn't torque win in 1/4 mile races and not so much horsepower? Anybody else put a set of ported 351 heads on their 289/302?
Tracy Blackford
Corona, CA
Restoration of '65 "Black" ford fastback in progress
Tracy Blackford
Corona, CA
Restoration of '65 "Black" ford fastback in progress