[My427stang]

The exhaust side will get tight at anything more than 1.67 even on the 4.00 bore, but the intake side on an FE has plenty of room.

The question is, what do you want the motor to do? If you want it to rev, thes troker wont do bad, but you want as much bore size as you can to allow room for a good set of heads and a big exhaust valve

BTW a 4.05 bore will happily accept a 2.15 intake / 1.67 exhaust combo, but thats about as big as you can get on either side