Yes these are off the shelf 440Source D-dished pistons as I am also running a 493 with the standard EZ heads. I was up around 12.0 myself when I had flattop pistons in it at first. Mine is a street car that I use 92 pump in and it is now at 10.6 and works great since it has good quench. And I use a flat tappet cam from Dwayne Porter. They are nice looking pistons you have. Ron


Last edited by 383man; 02/18/17 07:59 PM.