The math would have been figuring out how far before TDC the V is in case it was used for some timing, such as vacuum advance timing or centrifugal advance. I won't bother now I know it's not ignition related.
Jim
1935 QD 1.5 ton stake bed 1937 SD 1.5 ton stake bed 1944 MS 1.5 ton stake bed 1946 PW 2 ton stake bed