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Old 02-17-2013, 07:57 AM
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Transition circuit on Holley 4160 too lean.

Hi All,
I recently upgraded to 2.5 in exhaust pipe size on my chevy 350 and found that it leaned the A/F ratio. My carb is the 80457-2 it does not have adjustable Idle air bleeds or Idle feed restrictors. Here are my current numbers with a wideband mounted to the drivers header.

Idle - 13.5:1
Off idle to 2.5k - 14.7-17.5 There is no popping or anything, just that I see it go lean.
2.5k+ -13.5:1
WOT - 12.7-13.1

I am okay with 13.5 i think. My worry is in the off idle at low speeds, say 40-50 mph, depending on the load it will go way lean until I get to the main jets around 2500 rpms.

Is my best option to buy an adjustable metering block and if so, what are you guys using?
I saw this one from QuickFuel 34-8. Looks like it has adjustable IFR and powervalve restrictors too. Anybody use one of these?

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