Hypereutectic pistons and failures related..

.028 is still "tight" for K.B.

Check out their guild for ring gaps.

For Circle Track - Unrestricted .0080" per inch so a stock 360 bore should be .032

For Marine - Normally Aspirated .0080" -same gap as Circle Track

Street - Towing is .0080"

I don't know why they say for Street - Normally Aspirated .0065", guess that is for "normal" people. (those are the ones in the far right lanes on the freeway we go zipping past, ha ha)

The Wall Clearance is what really changes. Goes from Street - Normally Aspirated .0015" - .0020". Circle Track is .0030" - .0045". Marine .0030" - .0045"

Why Marine use is so much higher than "normal street use" IDK but like I said, we aren't "normal street" I guess.

I am asking for min Marine spec's (good point if the shop will listen thou)

KB Pistons for Automotive Applications:
http://www.kb-silvolite.com/kb_car/clearance_pop.php