The Ford Barn

aussie merc · 01-03-2025, 11:09 PM

removing the intake and checking valve clearance would definitely give you a lot of information sounds like its typical parked flathead todays fuel is basically dry[alcohol] and has little to no lubricity hence hich valve wear where as the fuel from the time of the flathead was oil based so high lubricity that's why i run a small amount of 2 stroke oil [same as your outboard or chainsaw ] in the fuel about 50cc to around 50 liters of high grade fuel This lubricates the valve stems and stops them from hanging up when left standing . I would try using a penetrating type oil [MMO] in a fuel mix and just run 2/3 tankfulls thru the engine just might clear it up and it wont cause any more hurt if it doesn't

01-03-2025, 11:09 PM	#21
aussie merc Senior Member Join Date: Sep 2016 Location: sydney australia Posts: 1,125	Re: Help troubleshooting miss at all rpms removing the intake and checking valve clearance would definitely give you a lot of information sounds like its typical parked flathead todays fuel is basically dry[alcohol] and has little to no lubricity hence hich valve wear where as the fuel from the time of the flathead was oil based so high lubricity that's why i run a small amount of 2 stroke oil [same as your outboard or chainsaw ] in the fuel about 50cc to around 50 liters of high grade fuel This lubricates the valve stems and stops them from hanging up when left standing . I would try using a penetrating type oil [MMO] in a fuel mix and just run 2/3 tankfulls thru the engine just might clear it up and it wont cause any more hurt if it doesn't