Pull the spark plugs, and get a 1/2" ratchet and turn the engine by hand. Feeling and hearing for anything out of place. The engine should smoothly turn without any noises, scraping, dragging on feeling of torque to turn it. You may even hear your noise. Maybe a windage tray got a little close? I would for sure get my hand on the oil pan just to feel if anything my be rubbing on it. Maybe get your hand on as much as possible to feel the noise. Fuel pump, oil pan area, valve covers, distributor, etc. Almost sounds like its half speed of the crank.
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize.
1977 Trans Am W72 400, TH350, 3.23 T Top
Everyone you will ever meet knows something you don't.
Bill Nye.
Last edited by TedRamAirII; 05-20-2018 at 08:15 PM.
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