If you have a straight true bore and the proper piston and rings- it should work fine with the 14 hp piston. You could also have it sleeved back to std bore if you'd like.
Obvious there is some issue, without complete dissassembly and inspection it's hard to pin point. How did you measure the bore? 3.485 is not correct. Bores are 3.25, 3.5, 3.75 for std bores. Add 0.010, 0.020, or 0.030 as needed.
What style piston is in the engine? Is it round or a Mahle pston?
Michael
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