I am rebuilding a 261.The cylinder head that came with he engine was a 235 (848) without drilling the steam vents drilled in the proper locations. I am having the machine shop drill them for me while refurbishing the head. The question they have is are the holes drilled perpendicular to the head surface or are they drilled at some angle?

Thanks in advance
Walt Williams
La Verkin,Ut

Last edited by 54Belair; 07/08/2013 6:32 PM.