454 std bore running 6.90's
I have a std bore 454 in a 3650lbs Chevelle it ran 6.93 (1/8). I have it for sale on RJ and everyone that has called about it says that there is no way it ran 6.90's in a heavy car. It has square port closed chamber heads, flat top pistons, hyd 305-305 575-575 cam, single plane intake and a 750 gas carb. Is this to far out of range for this type engine, or is it just a good combination???????????????