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My dad had his 235 rebuilt by a guy in Burien who is supposed to be real good but, the front and rear mains both leaked... and he took forever. (Mark at Earl's machine shop). He is supposed to be known as the go-to guy for them.
Larry at Aussie's machine shop is also supposed to be good. He is the one that did the machine work on the engine. Aussies is in Des Moines, N of 128th on Des Moines way.