The core of the problem with iron small-block Chevy heads is that there aren't any (cores, that is). It is becoming more and more difficult for the professional engine builder or weekend mechanic to ...

Chevy fourth generation aluminum big-block head is readily i.d. 'ed by "bow tie" emblem and new square exhaust ports that exit ¾ inch higher than previous D-port design. You'll have to drill new ...