Bob Munn stopped by today and when he saw my DC he ask if it was an AP. I didn't know what he was talking about. He showed me the serial number on the block and sure enough after the serial number was an AP. He said some of them had been fitted at the factory with aluminum pistons. Learned my new thing for the day.
 
Interesting. I have an LA that my Dad bought new and it is stamped HC which I assume means high compression?
 
What year is your DC? I have a 1952 DCS that is stamped AP. When I bought it the auctioneer said that stood for Asparagus Production!!! LOL Don
 

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