thank you for the info. I didn't measure them but there not the same size . the exhaust is somewhat larger than intake. most machine shops in my area have nothing to do with small engines. out of the 5 or six I called with in a two hour drive only one agreed to look at the block to see if he could bore it. one shop said they would recommend buying a new engine instead of rebuilding a small engine.one shop said the quit crank grinding because new cranks for 350s could be bought so cheap.
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