just cause you put a small journal 327 crank in a 283 doesnt mean its a 327. that makes 302 if bored.125 BTW tech ive got a 160 thermosat and it dont go over 165 the late blocks 64 and up are good for boring out because of higher nickel content the early blocks 57-63 and some early 64's arent so good lower nickel and they would get hot faster. and if you really want to go crazy make a 402. use a 1 inch stroker crank grind the pan rails down for clearance and with a bore job you've got 402 that combo is courtesy of big yohns racing in there olden days with the "shubert & herbert" blown sbc rail. anymore questions?