Can you provide additional specs on the PRC 260s? Seems to me that it would be hard to maintain a 10.7:1 CR with a -11cc dished piston...unless the head chamber is pretty small. Additionally, what head gasket did TSP use, thickness wise?
If indeed, the CR is less than the 10.7:1CR, then your numbers may be pretty close for your combo NA.
-Scott
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745RWHP/634RWTQ on 93 @ 10psi
806/676 on E85 @ 10psi
COTW 9/8/14
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