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EFV-8 Club Forum / 1940 Ford Discussion / 1940 MH station Wagon

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01-09-2010 @ 7:02 PM
Posts: 68
Joined: Dec 2009
Thanks for the details Tom. My block appears to be a post-1940 model because it has the raised deck where the intake mounts. I'd like to find a correct 1940 block. What casting # should I look for? Does the 3 3/16th bore equate to a 239 cid engine and 3 1/16th to 221 cid? I guess the 95hp engine requires the 3 3/16th bore. Were all 239 blocks in 1940 sleeved? Can a 3 1/6th block be bored to 3 3/16ths? As for the heads, I have two that are 81T-6049 castings. Should one be 6049 and the other 6050?

01-11-2010 @ 9:49 AM
Posts: 7245
Joined: Oct 2009
I don't know of any casting numbers to define a 1940 block. I identify the 1938 to 1940 24 stud blocks by looking for the raised areas by the oil pan for the core plugs, the exhaust manifold mounting areas are about 3/8" thick compared to the 1/8" areas on the later blocks and the pencil test shown in the 40 Restoration Guide.

You are correct in relating the bore to the cu in size of the engine.

With Ford items, I have learned the hard way to never say "all" or "always". Most 221 and 239 cu in engines built in 1940 were sleeved. The sleeved engines were stamped HS on the machined surface of the block for the intake manifold.

You can bore a 221 cu in engine to 239 cu in in most cases. Your machine shop should check cylinder wall thickness and sleeve any cylinders that do not have sufficient wall thickness. If you can find a block that was not sleeved, that would be my preference for rebuilding. The rings will seat better and the cast iron will not wear as fast as the "tin can" sleeves used in 1939 and 1940.

Yes, the left and right heads had different P/Ns. The right hand (passenger side) head P/N is 81T-6049 and the left hand (drivers side) head is P/N 81T-6050.


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