all depends on the port timing,if you lower the exhaust port without checking the timing of the crankvalve timing and the inlet and boost port transfer ports you could end up with throw away piston and liner.
most of the engines you see will have the lip of the liner showing thru the exhaust port,it doesnt mean the exhaust port timing isnt open right,it just means the crankcasing is open more then the exhaust port.
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