Thanks for your post and making the cylinder heads. It appears the oil feed trough for the rockers arm system is deeper than the cast iron heads. Do you still advise buyers of your aluminum heads to chamfer the hole and smooth out the casting like the cast iron heads?
No, the oil flow is controlled by the groove in the cam. We've put .070" restrictors in the heads and oil flow is the same as the 1/4" hole. The depth of the groove in the cam has absolute control of the oil flow to the rocker arms.
The Jalopy Journal
