Can someone tell me what the compression ratio would be putting 862 heads on an LQ4? I understand that they don't flow as well as the 873s I have but its the ratio I'm lookin for, 9.24 deck height with say a stock thickness intake gasket (not sure what it is)??? I believe the chamber on the 862s are 61cc. I have most of the particulars I just don't know the formula or head gasket thickness. If some of you could help me out it would be very appreciated Thank you!!!