Casting number on head: 3671587
Casting date: Driver side 0813 and 1783 in pass side.
This drive me nut, what does these casting date # mean? If driver side 0813 mean august/ 1st/ 1973, so pass side 1783 is month:17
If 0813 mean Jan/ 08 /1973 then 1783 is: August/ 17 /1973 ? This isnt sound right since 1 head made in Jan and another in August?
And if 0813 mean 81rd of 1973, 1783 mean 178rd day of 1973, why one head made after other 92 (173-81)day?
Anyone can help? Thanks!
Casting date on side of block is may/29/1973 if that help.
