Quote Originally Posted by blackchevee3
can you tell me what a307 bored .30 over would be, and is using 305 heads work ok thanks, also eldbrock performer 2 intake and cam, 600.carb
That will be a 311ci and the #416 or #601 1.84in / 1.50ex 55-58cc 305 Heads will work well on a 307+30 over build . Just check them Heads well for cracks .