Originally Posted by JaredOSU
Has anybody installed GT40 heads on their 351w carbureted engine? I was wondering if I would have to mill down the head bolts? Any input will be greatly appreciated!
A lot of folks have done the GT-40 upgrade, you don't need to "mill" down the head bolts, the head bolt holes on the gt-40 heads need to be opened up to 1/2" because the 351w uses 1/2" head bolts and the typical gt-40 302 cylinder head uses 7/16" head bolts.