I had a similar problem with the old 406 a few years ago. I found a piece of silicone about the size of a toe-nail clipping in the check ball. I put it back together and checked a few random bearings which were good. I then flipped the motor so the pump is on the bottom. I put a big trashbag lined box under the stand and submerged the pickup in a coffee can full of oil and primed the motor and watched the pressure gauge I had hooked up in the oil passage by the distributor hole. It made a mess of course but I verified that I fixed my problem.
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 Johnny US Army Retired
1978 T/A 463 Pontiac, KRE 74cc 300CFM D-ports, Howard's custom SFT, Nash Intake,QFT 950 E85 carb, TCI TH-350, 4200 converter 3.73 12 bolt [email protected]
1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car.
1972 LeMans 350 Pontiac H/S Drags project
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