Quote:I guess i'll get this motor ready to go as followszero decked block2355 pitons & 6 pack rods.040 cometic head gaskets Edelbrock RPM's milled to 78cc & gasket matchedCompression works out to about 10.6.528 Purple shaft 4 degrees advance it the ptv checks out.But i got another question .......How will advancing the cam 4 degrees affect the compression (now is 10.6) for pump gas on the street ????