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Old January 9th, 2017, 12:18 PM
turbobill turbobill is offline
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Join Date: Feb 2013
Location: northern NY when not flying
Truck: 1968 HM80 with a 478M and a few engines plus a Toro-Flow
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Default Re: Replacement 305 for a 1961

Maybe the "knock" is a valve a bit looser than the rest. Once the engine warms up, the clearance is reduced enough that it clatters no louder than any of the others.
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