Quote: How did you arrive at 10.73:1 compression? Did you actually measure/CC everything yourself? I ask because when I plug in the numbers for a flat top 493 into my calculator with an 84 cc head, .039 1009 4.410 bore gasket -4cc valve reliefs and -.017 deck I get 10.86:1.
The heads were new when I bought them in 2003, so the 84 cc number should be pretty close.
My pistons have a 6 cc valve relief. When I enter the numbers, they tell to put a minus sign before the number if it is a DOME but use only the number if it is a dish or a valve relief. I checked # 1 cylinder to measure the piston height at TDC. It was between .017 and .018 so I err to the high side on that one.
