Lifter bore
 

Can someone tell me the correct lifter to lifter bore clearance on a BBC with .842 lifters? Engine runs at about 110 degrees.

Thanks Anthony

I have always believed .0008 to .0025 was ideal but have seen looser on old motors and seen tighter on brand new blocks (need to be honed to proper clearence after heat cycling), Smitty

So in the middle should be good? Slighty used Dart block?

Thanks Smitty

My world block was at about .0015-.0018 fwiw, Smitty

These bores are measuring right at .842 and a couple lifters were stuck. Im assuming engine builder didnt hone for tolerance. Can these just be honed with a drill to open them up the required amount? Or is it a much more complex maching method requiring a machine shop?

Thanks Anthony

You're going to have to disassemble the blocks anyway to clean all of the honing grit out of them. Might as well take them to someone with the proper tools to do the job. I agree on the .0015 clear.