10-12-2014, 10:50 PM
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#288
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Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: 1971 K20- project just get driveable!!
Well no luck tuning the engine better and I did more root cause analysis. Cylinder #4 has a bit lower compression and a leakdown test indicates its leaking out the exhaust valve. I'm still surprised it won't fire since compression is still around 135 compared to the other cylinders at 155 to 160. I did all testing on a cold engine. It has good spark.
Seems like the head needs to come off, would be a good time to upgrade so I don't have to keep adding lead substitute to the gas. I'm kind of on the fence about what to do, crate engine or redo heads. Can the heads be changed with the engine in the truck? I'm really looking for the cheapest easiest at this point. I've got other trucks now that I'd rather put more time and effort into.
Still managed to haul some trailers for firewood hauling with 7 cylinder power! Pics in a bit
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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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