For years, I have kept a small database of these ZL-1 blocks, both factory, production and over the counter and Yenko blocks.. if anyone wants to contribute info, it is appreciated.... can PM me or email at
[email protected]
I have some older info. that when I first started keeping records of these years ago that is mostly photos and hand-written notes.
I am going to try shortly and get it all together and digitize all the info. to put it all in one place and make sense of it all..haha
But seriously, we are looking for the following info:
large casting number on rear flange
small cast date on side
small cast sequence number near cast date
any stamped numbers on front deck or oil filter area
any stamped numbers on main caps and/or center rear upper bell housing flange
if block has screw-in or press-in freeze plugs
also any anomalies... ie. extra stampings, casting differences, etc
and any photo documentation
Thanks in advance ..and thanks SYC for all the great information !!! Always learning !!
Max