4.125"
a 400 small block Chevy has a 4.125" bore.
get a big block or bore it 54 over
4.165"
4.155"
350 block, 400 crank. Main journals must be turned to accept 350 bearings. Stock bore is 377. .030 over is 383.
4.125"
421 c.I.d.
bore and stroke a chevy 400 smallblock.
4, and 1/8th inch.
4.125 inches
Factory stock, the 400 cu. in.
A 383 is a 350 block with a 400 crank. The block is bored to 4.030". A 400 has a 4.125" bore, so you'd need to bore the 383 roughly .095", which is probably not practical as the 350 is not made to be overbored that much.