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Old 08-01-2013, 12:47 AM   #7
Vintage Windmills
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Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
Re: 1971 K20- project just get driveable!!

Quote:
Originally Posted by Ol Blue K20 View Post
I would run the motor with Seafoam in the gas and oil that will clean the rings and valves. I would run it 30 minutes let it cool repeat several times andtest it again. You may get a surprise when the compression comes back
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Did the seafoam trick, ran 30 minutes, and its now about 140 psi Now all cylinders are 140 to 155, should be good, right?

Only thing that concerns me is the smoke in the exhaust but I think thats from the gas being old and the seafoam in there. It wasn't smoking much at startup tonight but after the seafoam got to the carb it started. Hopefully it all goes mostly away with new gas.
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades)
67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore )
86 CHV K30 502 th400, apple red NEW
71 CHV K20 350 SM465, ochre (saved work truck)
71 CHV K20 292 SM465, white, tach, PTO, (future project)
72 CHV K20 350 350th, medium blue (project stocker)
01 CHV K2500hd crew, indigo blue

^3 dont run and the others don't see winter either
'86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649
'71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642
'72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6
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