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Re: black coolant
Switch the "white "plug with one of the dark ones and drive it a bit and pull those two plugs again , if the #1 plug is white again you have found your leak in that cylinder , be it a Crack or bad head gasket . Before getting too crazy dump some Bars head gasket sealer in the radiator and see if that solves your #1 cylinder problem . Just a very small amount of water/coolant will give that steam cleaned / white plug look .
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1967 Factory short bed - Old school
'71 - 350 / 4bolt / 487 heads / Edelbrock C3BX
Muncie M-22 4 speed / Hurst Comp plus
Factory 12 bolt posi 3.73 / 255-70-15
Smoothed firewall / Factory cowl induction
Power disc brakes / power steering / 3.5-5" drop
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