Not moper, but the 516's list at 78 cc's I believe. The ones I have on my 383 have the 1.74" exhaust added, (flat valve heads with no "dimple"), and a very light cut to flatten them. They checked out at 74 cc's. With a no valve relief, stock piston at -.020" deck, it's pretty easy to hit 10.0 to 1 compression.
Thanks BBB....that is part of my concern....with castiron heads, and being used as a daily driver, I think I would be way high on compression. I am using Diamond Pistons with 440 rods...which put me at a .005 deck after cleanup on the block.
