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rotorwrench · 06-10-2017, 08:20 AM

The Big A cast in the head was the 81A head used with the 221 CID engines in the late 30s & early 40s up to the beginning of WWII. It would be consistent with a 1940 85 HP 221 CID V8.

06-10-2017, 08:20 AM	#15
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,440	Re: Flathead, what do I have here? The Big A cast in the head was the 81A head used with the 221 CID engines in the late 30s & early 40s up to the beginning of WWII. It would be consistent with a 1940 85 HP 221 CID V8.