WFHDANB426
Active Member
That's great info and you could create a new post about an easy way to check that the plug is installed because if an engine builder pounds that plug out before hot tanking the block and then it don't get back in then the oil isn't forced to go through the filter before it circulates.OK, I went out to the barn and drug out a bare 340 block. Please ignore the cat hair on everything! It's much better that mice and rat crap! Assuming you can remove the oil pressure sending unit next to the distributor, you can take a piece of wire and run down the hole. It should hit the plug at ~7 1/2" from the block top surface. If it goes in 8" or more, odds are the plug is missing. See photos below. First photo is were to insert the wire. Second photo: I put a read circle with the wire at where the plug is located and in the last photo I circled the hole below the rear main cap where the plug is installed.
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