Don Terrill’s Speed-Talk

I have a set of the GMPP valve covers for a big block chevy. I need to drill them for pcv and breather. They are both 3/4". There are no baffles in the valve covers. Can I just use baffled grommets? I don't really want oil mist all over the place. Thanks

The holes for standard grommets are 1.22", if memory serves correct. Baffled grommets will help, if you don't have a clearance problem, but they will not work as well as good baffles in a valve cover.