One issue I had on my 383 was the lack of valve reliefs in the piston. Flat top pistons that appear to be zero deck height.
The heads were milled for compression which made the piston to valve clearance issue worse.

Edit: FWIW the pistons in this were sealed power forged replacement HP pistons, but engine built in the 1980's.

Last edited by 451Mopar; 04/03/16 04:10 PM.