If the knurling was done on a guide that was still with in specs, not what you would classify as loose or shot, just needs tightening up some, that is quite a bit different than knurling something that is loose and shot. Knurling the one than is still pretty tight will last longer than if you just left it and ran it. Loose and shot always needs liners. I have had some that only received knurling on a couple valves that were slightly lose, still with in specs. Those all went more than 100K miles, and out lasted the vehicle in most cases. Those were stock engines though.
You kind of have to go with your machinist’s opinion and judgement. I know of one local machinist that the heads get liners no matter what you bring in, even new heads that need nothing. Lol….There are fewer and fewer machinist shops around to do the work. If your not careful you”ll end up on some 6 month or year waiting list.
Last edited by Jay S; 08-30-2023 at 08:12 AM.
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