Re: 400 Vibration New Build
My 406 is internally balanced, and I had my flywheel balanced along with my pressure plate. When I had the flywheel and pressure plate on my 350, I had some vibration come through the shifter and it got progressively worse as the rpms increased. After I had it balanced and put on the 406, the problem completely disappeared. Since you have an externally balanced engine, I wonder if the same process can be applied to fix the problem.
BillK mentioned something about unbalancing the flywheel. I assume this means removing a certain about of material from it by drilling holes in the flywheel were the clutch disc does not go?
When does it pop? On the 1-2 shift? The float level in the carb might not be high enough. It is also possible that your running out of fuel on the fuel pump side. What size fuel line do you have from the tank to the pump, and from the pump to the carb?
1967 Camaro SS: 406 sbc, 522hp/514 ft lbs, Doug's 1 3/4" headers, M20, posi, 3.73's, vintage air gen IV, IROC steering box, Comp Eng. weld-in sfc's & traction bars, chrome US Mags
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