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Around a month ago I was doing my regular search of Craigslist for old Mopar stuff. I stumbled onto a flathead 6 core "dodge" engine, for way to much money. But it was only a couple hours from me, and I still had a few minutes of my lunch break to kill. As I scrolled through the pictures, I realized it also included some pretty expensive new parts, and was actually quite a good deal. An email and some phone calls, and the owner kindly agreed to hold it for me till I got time to get it. I picked it up yesterday. It poured rain on the way home, so I didn't get a chance to look it over very well. It is a grimy Yellow, with red underneath, industrial 251. I am not sure what it is out of, brass tag has the Chrysler pentastar, so must be '60s. It does not have the pad for full flow oil filtration. At a glance, the exhaust valves are standard, not sodium filled. Rear sump oil pan. Turns smoothly 270* then stops hard, has at least 1 stuck (open) valve, but need to pull the tin off to see what's up. A rebuild is planned, so likely no big deal. Head is off, and has been milled an unknown amount. Most likely cut to up compression. Also included was a new Asche supplied cam regrind, marked 380, split exhaust manifolds, and an unused AOK triple carb setup, linkage and carbs all complete, but linkage is set up for a truck. Anyone know if I can just flip this over and make it work for my passenger car linkage? I belive the cam is their Isky 3/4 race clone, which is their recommendation for trucks and cruisers that want more power, but don't actually want to deal with the hassle of a big cam. I am not sure why I thought this was a good idea, but here I am. Anyone have a link to a good write-up on how to fit the 25" engine in place of the 23" in '48 Plymouth? Hey Canadians: What years did y'all get the 25" 218, and what did the compression get up to? If they kept up with US improvements, a early to mid '50s head should be around 77-84 cc, which would yield almost 9-1 on this 251. On industrial engines, how did the crank case get vented? PCV? How does fresh air come in? The oil fill tube had a sealed cap. Will a 23" oil fill tube swap on? If i want to run sodium valves, are the larger diameter valve guides available? Or can the old ones be drilled and reamed? Any reasonable way to convert this block to full flow oil filtration? My 217 runs well, and I have more pressing things to fix, so I am not going to be in a hurry to swap this in. ETA: Head number is 1327236 (cast number matches stamping) Anyone able to give me any info on it? Compression ratio? Year? It is internal bypass type, has large temperature sender threads, and has head mount linkage boss threaded, but plugged with a bolt.