IIRC the valve centerline is moved to the bore center. Look closely at the head pics posted. They have a 1/2" wide ledge right below the bottom row of head studs. The 440-1 does not have this. Thats roughly the amount the valves are moved. Even if it's not the 13 degree valve angle would require custom pistons. Stock is 15 degree.

Last edited by fbs63; 05/25/22 07:29 AM.