Cylinder Head Core Thickness Acceptance

Cylinder Head Cores Minimum Thickness for Core Acceptance   Cummins Head  Small Cam - N-14  Min. 4.35"  L-10  Min. 3.925"  4 and 6 BT  Min. 3.725" Cat Heads    3406 A and B  Min. 4.420"  3406 E  Min. 4.725" Detroit Heads  71 and 92  Min. 3.550"  Series 60  Min. 6.490"