Quote:
Originally Posted by rotorwrench
It appears to be a pre-41 24-stud 221 block. The counterbores may be for sleeves that have been removed. If it still has the 2.399" mains and had studs for the mains it should be a 1938 or possibly early production 39 standard.
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I rechecked, the main bores are .100 larger than 36-38. Does that make it 39 and 40? If that's correct, does the 3.187 bore mean it is a mercury block? would the Merc blocks have had the remnants of a sleeve counterbore at the top of the bore? It didn't have any studs in it when I got it.
This was under a friends workbench for 20 years, he bought it second hand as a brand new block so it's probably a ford service part. The exhaust ports are perfectly clean and so is the waterjacket, it looks unused to me. There are some miscellaneous numbers and symbols stamped at several locations.