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Terry,OH · 12-25-2017, 08:27 AM

41-42 block is nearly identical to the 39-40 block 81A but with a raised surface under the intake manifold. Look for other identifying marks stamped on the block surface around the intake manifold.

12-25-2017, 08:27 AM	#2
Terry,OH Senior Member Join Date: May 2010 Posts: 4,795	Re: Flathead block ID help 41-42 block is nearly identical to the 39-40 block 81A but with a raised surface under the intake manifold. Look for other identifying marks stamped on the block surface around the intake manifold.