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Re: Sbc vibration at 3000 rpm
You might try removing the fan belt for a short fast idle to narrow down these items run by the fan belt...Ed 
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1970 C/10 350/T5 SWB stepper...
1979 Corvette 350/Auto T-top...
2010 Acura RL...
2015 2500HD Z-71 Silverado...
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