3917291 heads

[pjbizjak]

Does anyone know if GM had a slow-down period of casting the 3917291 heads? I've been looking for a set dated mid March 68, and it seems like there are lots of 67 castings and 68 May-June, but Jan Feb  and March 68 castings are almost non existant.

[68Zproject]

Try Tracy Performance in MI?  He has lots of castings and dates.  Not cheap though.

[opelitis1]

Have a D3 8 bare casting - 1 only..  Close but no cigar..
T.

[pjbizjak]

Thanks, my trim tag says 04A(1st week of April 08) so engine would have been assembled probably 3rd or 4th week of March 68.