Claimed 60k miles, came from a running engine. Good amount of carbon but no signs of detonation, I can provide close-ups/specific angles if desired, just PM me. Most of you probably know - but these are a great budget power-adder if you're doing a stock rebuild on your BP05 or BP4W as they are higher compression (10:1). Re-ring before using, they have the original rings on them. $150.00 shipped obo OR bonus - straight trade for BP05 alternator and bracket.