Quote:
Originally Posted by Bored&Stroked
Nothing like a good ole' 'Keystone' block - looks very similar to a 1940 Merc block (which weren't relieved), or a WWII military/industrial block (with the factory relief).
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Interesting, Dale. I have three "keystone" blocks. Two are not relieved and one is. Sadly, the relived and one of the non-relieved are cracked in the #3 intake. Not sure what I'm going to do with them. They are all raised intake and 3 3/16" bore, so like you said, similar to Merc blocks.