Thread: My 1963 GMC Bus
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Old March 2nd, 2022, 01:10 AM
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Ed Snyder Ed Snyder is offline
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Join Date: Jan 2013
Location: Medford, Oregon
Truck: 1962, 1965, 1967
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Default Re: My 1963 GMC Bus

Hoooo boy this is not what I expected, but I'm glad I checked. I'll check the other side next.

To be honest I don't know if this is buildup or melting/welding. The really interesting one has a scoop in it where the valve was hitting, so I'm assuming buildup.

The white piston had a cylinder completely full of ash.
Time to start looking for a replacement V6?
Ed Snyder
Medford, Oregon
1962 K1000 Suburban 401M & SM420
1965 2500 Suburban 351C & SM420 with Watson overdrive
1967 CM1500 pickup 351E & NP435
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