[mach0415]

I noticed the distributor bolt is missing and upon further inspection, realized the cast boss is broken off at the top and side of the head. So as I began to research replacement cylinder heads, I realized that the head is a Ford script USA service replacement. With all this in mind, I began to put 2 and 2 together as I read over Vince Falter’s Diamond engine info on fordgarage.com. Sure enough! It has a diamond near the timing gear inspection cover and casting number L121 or L127 near the valve cover. So it appears this is a diamond service engine with a December 12, 1937 or 1941 (cannot make out which year exactly). This would explain the apparent blank engine serial number pad and wonky number stamped after the fact. It has .020" over pistons from a more recent rebuild with the crosshatch still visible in the cylinder walls.