Lakeeffect
Drive Fast , Take Chances
I was wondering what would be acceptable bore wear on a stock 340? I am on a tight budget and want to reuse the old pistons. Thanks FABO!
You need to measure the bores individually with a dial bore gage. Then mic the pistons properly. Then see if the clearance is within spec or not, or even close. However, the most important wear occurs on the insides of the top ring land where the ring has to seal. You can have acceptable piston to wall clearance and still have junk pistons.