Here is a link to a picture showing the side of a 261 engine.You will notice that the hole is inbetween the two freeze plugs,closest to the left freeze plug.Keep in mind the block is upside down.Hope this might help.

http://img128.imageshack.us/img128/9659/sideof261block6dh.jpg


1951 3100 Chevrolet
1951 Chevrolet Suburban Carryall
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