How much horse power would a 1964 327ci engine bored out 40 over push?

Answer 1

Depends on which 327 you started with. Chevy made many versions of the 327 in 1964 depending on which heads and what fuel system was used. 2 barrel, 4 barrel, or FI. The cylinder heads used on this engine (and some others of the era) were the 3782461X head with 1.94/1.50-inch valves. These heads had the commonly found double-hump shape on the end of the head. Beginning in '64 and through '68, cylinder heads with the double-hump shape also used 2.02-inch intake valves (aka fuelie heads). Castings with 2.02-inch intake valves were also used on the 365hp (Holley carburetion) and 375hp (Rochester fuel-injection) Corvette 327 engines. There were also heads with an upside down V in the 250 hp model. 327 engines ranged from 250 hp to 375 hp depending on heads and fuel supply.