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Alex V. · 03-22-2018, 02:08 PM

Seafoam is good stuff when used properly. 1 oz. per quart in the oil for 500-1000 miles before a change will help dissolve gunk. In the fuel it'll help capture and burn any water, and clean the carb. and intake side of the engine. Put 1-2 ounces down each spark plug hole and let soak overnight to clean gunked up rings - just crank it over with the plugs out to blow any leftover out, or you may hydro-lock if there's any liquid left in the cylinder. Expect lots of white smoke for a few minutes afterward.

03-22-2018, 02:08 PM	#7
Alex V. Registered User Join Date: Mar 2013 Location: Campbellsville, KY Posts: 888	Re: 250 engine and Sea Foam? Seafoam is good stuff when used properly. 1 oz. per quart in the oil for 500-1000 miles before a change will help dissolve gunk. In the fuel it'll help capture and burn any water, and clean the carb. and intake side of the engine. Put 1-2 ounces down each spark plug hole and let soak overnight to clean gunked up rings - just crank it over with the plugs out to blow any leftover out, or you may hydro-lock if there's any liquid left in the cylinder. Expect lots of white smoke for a few minutes afterward. __________________ Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.