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JM 35 Sedan · 07-11-2016, 08:48 PM

That is a '37 or early '38 21 stud engine, built prior to intro of the 81A, '38 24 stud engine, which according the Motor Building Ledgers, was first built 11/24/37, and was number 18-4380120.

I personally consider the '37-E'38 engines to be the best of the 21 stud engines for these reasons:

● Improved water pumps over earlier pump in heads design. Better water flow, better cooling.
● Thicker cylinder walls allow boring to 3-3/16" if performance increase is important. Earlier 21 stud blocks could only be bored safely to ~ 0.060" over the standard 3-1/16" bore.
● Good replacement engine for '32 to '36 vehicles allowing use of their original type heads with water pump in heads. Block off plates are available to cover holes required for '37-'48 type water pumps. Final assembly looks very much like an original '32-'36 engine IF that is of any importance to the vehicle owner. Of course this would not be show correct.
● Same insert main bearings and crankshaft as used in '36 LB engine.

07-11-2016, 08:48 PM	#4
JM 35 Sedan Senior Member Join Date: May 2010 Location: Near Rising Sun, Maryland Posts: 10,876	Re: Is this a 37 motor? That is a '37 or early '38 21 stud engine, built prior to intro of the 81A, '38 24 stud engine, which according the Motor Building Ledgers, was first built 11/24/37, and was number 18-4380120. I personally consider the '37-E'38 engines to be the best of the 21 stud engines for these reasons: ● Improved water pumps over earlier pump in heads design. Better water flow, better cooling. ● Thicker cylinder walls allow boring to 3-3/16" if performance increase is important. Earlier 21 stud blocks could only be bored safely to ~ 0.060" over the standard 3-1/16" bore. ● Good replacement engine for '32 to '36 vehicles allowing use of their original type heads with water pump in heads. Block off plates are available to cover holes required for '37-'48 type water pumps. Final assembly looks very much like an original '32-'36 engine IF that is of any importance to the vehicle owner. Of course this would not be show correct. ● Same insert main bearings and crankshaft as used in '36 LB engine. __________________ *John* *"Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein* Last edited by JM 35 Sedan; 07-13-2016 at 12:41 PM.