Quote:
Originally Posted by low63gp
he cant get #4 and #6 cylinders to fire.
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Any chance #1 and #7 are weak? If so, adjust your idle mixture screws and/or repair the carburetor. 1, 4, 6, and 7 are fed from the same plane of a dual-plane intake manifold, from the same carb primary throttle plate/venturi.
Any vacuum ports on the runners to #4 and #6?
As said--120 psi compression is pretty weak. Not weak enough to kill a cylinder or two, but overall not good. Depends somewhat on altitude, cranking speed, and whether or not you remembered to open the throttle some. Are you sure your compression gauge is accurate?
Low compression because the cam timing is wonky?
Did they degree the cam, or just slap it in "dot to dot" and hope for the best?