Just bought a 57 chevy with a 400 motor casting # 3951509 1974-1980. Looking to put in on a 671 Hampton blower 7.5:1 compression street use. I haven't worked out all the details yet but my question is will it overheat due to the siaemes (sp) cylinders. I think the steam holes were drilled out being a newer block. Please help!
Thanks