Check the block casting number. If it's 3733340 or 3837012 it's
a 261 with a 3.75 bore. The head casting should be 3703570 or 3836850.
Block casting 3836233 or 3837004 will be a 235 with a 3.56 bore. Head #
3835913 or 3836848. If you get any other numbers send them to me and
I'll find out what it is.
**********************************
Doug,
These are Chevrolet 6 cyl displacements not GMC.
DW
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