looks like im pulling the motor apart already

ou812 said
With -17.5cc dish pistons, zero deck, 62cc chambers, and typical .040 gasket his compression is 10.5:1 which is more than enough to detonate with ANY camshaft if he got a bad batch of pump gas or old gas...
And that's if his timing was perfect. Guys don't realize with iron heads once you go over 10:1 even with good quench you have the potential for detonation using PUMP gas. And where the cam was installed has an impact on that as well.

You say his machinist told him it's zero decked...CHECK it yourself!!

I'm just sayin.....

Had a guy come up to me at a gas station yesterday and said I had a good sounding car. He went on to ask if I was running race gas. Nope. He said a local (not such a good IMO) speed shop had built him a 11.5-1 CR engine with alum heads, ferd or chebby I didn't pay much attn. I mentioned the price of 110 race gas and told him how well the fish runs on 93. Kinda let the wind outta his sails. Poor guy.

Funny how a purple 508 cam and 3" flowmaster 40s will bring them out.