C-153 valve clearance

What should the valve clearance be on the C-153 engine. i tried searching the internet and have found everything from exhaust and intake at 0.014 to intake 0.017 exhaust 0.020. does anyone have an international manual that gives the spec?
 
(quoted from post at 03:05:51 07/16/18) 504 manual says .014" Intake and .020" exhaust tappet gap.
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I might add too that older C123 engines whose pistons were replaced with Fire Crater pistons had the exhaust valve clearance changed from .014 inches with cast iron pistons to .020 inches with the Fire Craters. This would primarily affect Farmall Super C and 200 tractors although I am not sure of the 100 series. Everything from the Farmall 240 and up or onward had the exhaust setting at .020 inches. We found out the hard way back in 1963, when I installed the Fire Craters in our Super C an soon burnt the exhaust valves later. Replaced the exhausts and set to .020. No more problems. I still have the tractor and it runs properly.
 

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