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26 lakes · 05-23-2012, 10:17 PM

The center water passages in the top of the block are round. The Ford is a trapizoid. The 39 block has a dime size freeze plug on both sides in the bottom of block where the oil pan bolts on.

05-23-2012, 10:17 PM	#2
26 lakes Senior Member Join Date: May 2010 Location: Lee's Summit, Mo Posts: 338	Re: 39merc block The center water passages in the top of the block are round. The Ford is a trapizoid. The 39 block has a dime size freeze plug on both sides in the bottom of block where the oil pan bolts on.