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Old 05-22-2012, 12:41 PM
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Idle Fuel Restriction -too big??

My buddy recently purchased a pair of Holley 80576S 750cfm blower carbs for a BBC 496 and they run really, really rich at idle. (no drips/idle set/no leaks/4.5pv) I took the bowls off to see what jets he had in there and took a closer look at the metering blocks. It's a 4-corner idle, so the secondary metering blocks are identical. When I saw the IFR's they looked huge! So I measured them and they were .100....definetly huge!! I then measured the metering block from a plain 750 and they measured at .030. The screw in idle air restrictions measured at .070...which is normal for a 750.

My question is....are the IFR's too large at .100 ???
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