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Back when I still had my factory original 305 in my El Camino and was nearing 300,000 miles it had a lot of carbon in the engine. When going up a hill the engine would ping, and it would diesel run when I turned it off.
I tried the seafoam. I recommend doing that away from your house, as the smoke cloud is huge, and people will report a fire to 911. I did mine at an industrial area on a weekend. There was no magic transformation, but maybe a slight improvement. I used a bottle of Techron for every fill up for three full tanks of gas and then changed the oil and that helped more.
In the end, that engine was just worn out. It smoked from oil blow by of the rings and valve seals. The real cure was a brand new GM crate engine 350 for $1,700 and the long Thanksgiving weekend to do a swap.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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