The Stovebolt Site Forums The Shop Area Engine Shop does a 1955 2nd series 3100 6 cyl have vented valve covers

please review my findings and let me know what you think. it is quite involved, and a little bit confusing, as there are different formats for different years. thanks.




the a157 on one web site breaks down to
block date-casting code

A = January
15 = 15th day of the month
7 = 1957


the FI2IHE on one web site (gm heritge site for 1957 trucks - all of the other years had a different format) breaks down to
engine serial number

F = Flint
1 = January
21 = 21st day of the month
HE = 4000 regular production for 3100s, etc.


so, if correct, the engine was cast on January 15, 1957
and the engine serial number applied on January 21, 1957.


if I am right, I have a 1957 engine in a 1955 2nd series 3100, and someone put in a pre-1955 valve 'vented' valve cover (maybe to make it look cool????)