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Re: 1971 K20- project just get driveable!!
Did you try new spark plugs cap and rotor? Or a different wire? Try swapping a wire from another cyl to see if the cyl fires and the other now does not. Then try swapping plugs from another cyl too. Sometimes even a new plug can be bad.
Yes you can pull heads while in the truck. But keep in mind that fresh heads on a warn out bottom end will ultimatly make you burn more oil on decel and make more blow by into the crank case and in general will be a smoker. That said i dont concider 155 to be a bad compression number but don't know what your engine was when fresh.
But to hazzard a guess i'd say new heads with hardened valve guides and umbrella seals would keep you on the road for a while.
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