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Maximum safe bore on any motor will be determined by sonic checking of the cylinder walls. You need 0.135" thickness after boring, honing, etc. You could determine how much the head could be milled...

Yeah, you're welcome welder :rolleyes:

http://www.thehotrodgirl.com/lakepipes.html

Weir Hot Rod Products 4911 Paoli Loop Rd. Napa, CA 94503 ... 1940s, 1950s and 1960s custom accessories, Lake pipes

Yeah, you could rebuild it stock with some tweaking such as hard exhaust seats and stainless valves to tolerate today's unleaded fuels. Here's a source for obsolete parts that I've used in the...