ZL1 or Yenko Block?

Eddie M. · #1 11-30-2003, 06:59 PM

here's the casting on the front

Eddie M. · #2 11-30-2003, 07:02 PM

on the back there is no plate used, the holes do not exist to bolt it on instead a soft plug is used

Eddie M. · #3 11-30-2003, 07:04 PM

another pic of the front casting

Eddie M. · #4 11-30-2003, 07:06 PM

casting number on the back

Eddie M. · #5 11-30-2003, 07:13 PM

also casted in on the opposit side of the casting number is 06017 on the front stamped in behind the timing cover SY30 BQ and stamp in on the timing cover surface mounting is (9578) this block also has screw in freeze plugs

Stitch · #6 11-30-2003, 08:45 PM

From Mortec website .

3946052....427.......69......4-bolt, Alum. ZL-1, Mark IV

http://www.mortec.com/bbc.htm

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