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Discussion Starter · #1 · (Edited)
i have an 305 vortec that has been rebuilt. it originally came with an tbi but now is carb. the carb im using is an 600 cfm holley VA. with an holley street performance intake, hei instead of point, and holley fuel pump and pressure regulator.

The problem im having is, out of the 2,4,6,8 side there's a small back fire out the tail pipe at idle, black smoke is coming the tail pipes and it has a eye burning odor. :confused:
 

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youmight have a sucked valve the same thing happened on my truck and how you find that out is take a peice of paper and wold it at the end of your exhaust pipe for about a minute and if it sucks the paper to it then thats your problem
 
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