just one more vote to run it. it WILL be fine. a little noisy on start up (i like that sound, it's very comforting. you know you have forged pistons). just don't beat it when it's cold (you shouldn't anyway). i've run more than that in street engines. "it'll be noisy! it'll burn oil! you'll have sealing issues! ring life will be compromised!" none of the above were encountered. in a previous life i had a 340 duster with near .009 clearance, and it was noisy when cold, and you could hear them all the time, but that was one tight little screamer. i put a lot of miles on it, and it saw over 7,000 rpm daily. well over. and i gave it a little squirt of nitrous (this in the 70's when nitrous was scary and friends were blowing their stuff up using it). i put 45,000 miles on that engine before selling it, and leak down was still less than 3% all 8 holes. no freshen up. it went to Minnesota to run in a real race car.

conforting post. LOL

I think Im leaning towards the MP ,528" solid cam now...

Your rings won't last as long and if you have really tight quench you run the risk of tapping the cylinder head with the piston. It'll probably also slightly change your piston to valve clearance a bit. Seven thousandths is not out of the realm of usable though and I wouldn't be afraid to run it like that. Being a forged piston the chances of breaking a skirt off are almost nonexistent.

I'm running .010 in mine. Drag car with Venolia 4.505 bore x 4.25 stroke.. 14.75:1--B1's.. Aluminum low deck Indy block. 6.535 GRP rod..

When I asked Tom Prock, he said .0085-.011 on my application..

Leakdown has been great, and no smoke.. Also no noise from slap on start up.


Chris..

It won't hurt a thing! Run it and forget it. Geeez..Lets say he went smaller, runs it two three years and does a fresh up--little hone, new rings and oh my! I am at .007 now--big deal I would send that fresh up job out in the world knowing it would run even better than before---Too much tech thinking , not enough rubber burning around here. Drive the snot out of any Mopar you have--Thats what they were made for and life is short--drive more type less