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Re: black coolant
My guess would be exhaust leaking out combustion chamber by way of head gasket or crack into water jacket. I've seen that happen without coolant getting into oil.
I just fixed my '72 350. I had a frozen in head plug that led to pulling head which led to discovering a crack in head with coolant traces evident which is why plug froze. The coolant was blackish but the engine was clean as a whistle inside and so was oil. It just burned off the coolant. Only smoked when I started it (after sitting for days) and a valve would be sticky. Cleared up and ran fine once warm. It didn't use much coolant and this was going on for a while. I was figuring on needing an engine. New heads and it runs better than ever
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"
GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim
"Don't call me a redneck. I'm a rough cut country gentleman"
R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
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