Thread: Piston position on 383

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Originally Posted by rdobbs

Tech I don't know much if anything about squish. The pistons are
11 to 1 Comp. I was wrong about the domes. Don't really appear to have
any, but two nice notches for the valves. I could not tell much about
the picture you posted, but thanks.

To say that you have 11.0:1 pistons means that all the accompanying values (cylinder volume, combustion chamber volume, piston deck volume, head gasket volume) have to be exactly what the piston manufacturer used to determine that he was building 11.0:1 pistons. Pistons by themselves do not determine the static compression ratio. It is determined by the 5 values added together and then divided by the sum of the piston deck volume, head gasket volume and chamber volume.

Stock Chevy heads have the valves angled at 23 degrees from the centerline of the cylinder bore. Can you stand at the back or front of the short block and visualize that the valve pockets in the piston crowns are angled a little toward the top of the motor?

Bottom line: Are you willing to loosen up and share some valid information so that we can help you, or are you going to wing it alone, asking single questions one after the other? It's no skin off my nose either way.

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