Join Date: Dec 2012
Location: Gastonia, NC - Born & raised in Connecticut - 31 years
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drg44: "was running unbelievably good. Now I notice when I get on it and running thru gears 1-2-3 its has a slight hesitation before I hit the next gear as if the carb is pumping too much gas."
PJ: What RPM do you shift at? I suspect it is either a fuel delivery problem because it is not getting enough gas if shifting at higher RPM's or an ignition problem.
What RPM does it begine to do this? Try a wide open blast to 4,000 RPM's, then 4,500 RPM's, then 5,000 RPM's, then 5,500 RPM's.
Crappy gas from sitting or water in the gas.
Air cleaner needs replacing.
Could be a fuel filter, fuel pump going bad, rubber fuel line going bad, carb issue/adjustment from lack of use.
Could be an ignition problem. You did not say if points or electronic. If points, gap or dwell closed up, points burned/pitted, corrosion on rotor/cap, a bad spark plug wire, coil going bad, timing is off, stuck/sticking mechanical weights in distributor, timing curve incorrect, bad engine to body ground, spark plugs improperly gapped, spark plugs fowled, spark plugs worn.
Could be a vacuum leak - hose, carb gasket, or intake gasket, bad PCV valve.
Oil pressure low at upper RPM's not providing enough oil pressure to the lifters. Lifters going bad. Rocker arms not adjusted correctly if you have poly locks or one has backed off loose if you torque them down. Incorrect valve springs for your cam swap and springs are weak or have weakened with use. Valve retainers bottoming out on valve guides due to incorrect clearances. Valve spring coil bind.
Exhaust problem. Collapsed muffler. Heater valve stuck closed if factory cast iron manifolds.