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Drbrown · 07-04-2015, 01:11 AM

Strongly recommend the compression test. Again, what color is the "smoke" ?? Assuming (1) the engine is running smoothly under routine conditions and (2) the exhaust emission pressure patterns [puffing sequence heard and felt on your hand] and the emission of exhaust condensate appear SIMILAR AT EACH of the two exhaust pipes ....

.... then IMHO if this "smoke" is something new and you have made NO CHANGE in the oil you historically use, or the oil level you maintain in the crankcase, suspicion points toward an internal problem such as (a) coolant leaking thru the head gasket to be vaporized in the combustion chamber, (b) a hung-up or broken piston ring, or (c) even a dreaded crack in the block. Watch your coolant and oil - do levels drop abnormally or are they contaminating each other ?? Unsure about carb adjustment as that would likely affect the entire engine and not just the RH cylinder bank. If the engine is running smoothly and the two exhausts sound and feel normal (i.e. no distinctive "popping" at the RH one), I don't think at this time that a valve hanging up.

Keep us posted.

07-04-2015, 01:11 AM	#12
Drbrown Senior Member Join Date: Oct 2013 Location: Glens Falls NY Posts: 1,403	Re: Late Model Flathead Blow By Strongly recommend the compression test. Again, what color is the "smoke" ?? Assuming (1) the engine is running smoothly under routine conditions and (2) the exhaust emission pressure patterns [puffing sequence heard and felt on your hand] and the emission of exhaust condensate appear SIMILAR AT EACH of the two exhaust pipes .... .... then IMHO if this "smoke" is something new and you have made NO CHANGE in the oil you historically use, or the oil level you maintain in the crankcase, suspicion points toward an internal problem such as (a) coolant leaking thru the head gasket to be vaporized in the combustion chamber, (b) a hung-up or broken piston ring, or (c) even a dreaded crack in the block. Watch your coolant and oil - do levels drop abnormally or are they contaminating each other ?? Unsure about carb adjustment as that would likely affect the entire engine and not just the RH cylinder bank. If the engine is running smoothly and the two exhausts sound and feel normal (i.e. no distinctive "popping" at the RH one), I don't think at this time that a valve hanging up. Keep us posted.