Thanks for sharing the info.
Together with the original factory angle, it can make things ugly.

ValveCoverBoltHoles-TrickFlow.JPG
Last edited by 440Jim; 12/11/20 11:23 AM. Reason: Added points plotted on graph

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1