The hole size is nominal, so .904 is Chrysler. Not Chevy.
The lifter size SHOULD be made with the clearance built into it. Remember A-B=C?
A is hole size. .904
B is lifter size. .903
C is clearance. .001
I know some of the lifters are coming .904 and I ASSume it's so you can fit them but it's about impossible to hone a hole straight and round that's that small and short. A couple of tenths maybe.
Agreed. There is no .904 " Chevy" lifter. That is a Mopar size, that Chevy guys, and Ford as well, have adapted to take better advantage of the ramps/lobes, and robustness as well.There is no standard among lifter manufacters, you kind of need to know who does what with their particular brand. I have a drawer full of almost every lifter I can imagine, just for sizing purposes, and even then, they may change and be more than .0005 off when you get a new set. I often have semi custom lifters made, to better size for an existing block that has been bushed ( or not) and can dial in the sizing better if they arent going to re-bush. I can also re-hone a bushed block, get a semi custom, and save a lot of extra cost for the customer.Bottom line, my opinion,get the lifters you plan in using, then size accordingly, UNLESS< you already have a known
bore issue ( size or roundness).
