The 512 inch low deck engine is just about ready to go to the dyno. Need to screw on the correct oil pan and finish up a couple of details. This is a pump gas, hyd cam engine with old Mopar aluminum heads. The heads were ported by Modern about 15 years ago. I don't remember the compression ratio on this engine, maybe around 10:1? I'll have to look it up. It should make around 575 hp on the dyno. It made 485 rwhp on the chassis dyno earlier this year in my Coronet but that was with cast iron manifolds.