lifter bore adj hole

[Bored&Stroked]

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Originally Posted by Tim Ayers

Depending on the type of cam you are using, I may suggest scalloping the top portion that faces in towards the valley. With a high lift reground cam, the adjusting screw on an adjustable lifter an sometimes sit below the top of the lifter boss which makes it hard to turn the adjusting screw.

Good idea! I usually do this as it allows you to adjust the lash with the lifter all the way down on the heel of the cam (which is where you're supposed to do it!).