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To lower compression with out changing pistons only leaves a few options. As one person already suggested you can use a thicker head gasket. Also find a head gasket with a larger bore size. Anouther way is by taking the heads off and porting the chambers larger.
If you goto head gasket at .050 thick with a 4.100 bore and open the heads 5cc each it will drop you down to 10.9:1 compression. If you can open the chamber a total of 8cc you will have 10.6:1 compression
hope this helps
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