Thanks guys. I am considering decking but hate to pay the cost for less than 10hp.What I have is a silvolite piston with 1.779 compression height+1.50 which is half the stroke,(3.00" stroke 283 motor),+5.7 rod length= 8.979. Subtract that from sbc 9.020 deck height and I come up with .041 in the hole. Using the compression calculator I get about 8.821:1 static,and 8.086:1 dynamic.Thats using a .016 gasket that Denny suggested with 58cc heads
This is my first attempt at figuring CR per engine spec's so I may be missing something.
Other spec's are piston head relief 6cc;gasket bore 4";cyl.bore 3.935";deck clearance .041;stroke 3.00";rod length 5.7";cam intake valve closing point 41 deg.ABDC.
So .041 deck clearance+.016 gasket=.057 yuck!