No, the difference is the area around the bore and the 270 can not be bored to match what can be done with a 302. 270 and 302 blocks are taller than 228 and 248 blocks to make room for the 4" stroke. Bill Fisher recommended using the 228-248 crank in street engines with a 270 block. Just building a 248 would be good if pistons were available. He claimed the shorter stroke was smoother and lasted longer due to less piston travel.
