....Thanks Pat, Thanks 61Bone, I'll get a step drill as I found one for a good price {$25 bucks}. The carbide cutter was $75! BUT before I get it I took an old metal valve cover & drilled it out to 1 3/8" & put my new baffle in. I want to make sure it doesn't leak oil before drilling the aluminum ones. That's what the 1 3/8" hole in the valve cover was all about; to install a baffle..... Bill