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years back the only way to check a valve guide bore was with an oversize mandrill .0005 to .005 was in the regular kit -- we had one of the guys who was real good on the lathe make me a set of lifter bore go no go gague in .0005 thats a 1/2 size --- But we dont use them today we use a bore scope and check roundness as well -- now putting a .001 bore scope dial in a lifter bore and as you operate it up an down and side to side you can see the difference between handed sanded and ball hone much steadier with the ball hone this is all for flat tappets rollers do other stuff -- jz
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