Re: 59A-B Vacuum at dipstick tube
My first thought is intake manifold gasket...but the fluctuating vac makes me scratch my head a bit. Really shouldn't pull vac at the dipstick if there's a proper crankcase vent elsewhere. Hmm-intake is still where I'd start my search I believe, at least after maybe pulling each plug wire off in turn while idling to see if there's a weak cyl.
Terry
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"It don't take but country smarts to solve the problem" (Smokey Yunick)
'41 Merc Town Sedan / 260" 8CM engine
'66 Fairlane four door / "warmed up"  302
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