Holley 4160 idle problem
Hello, finally rebuilt my holley 4160, all factory specs/settings, nothing has been modified/drilled. The thing runs like a S.O.B. in all conditions except idle. I adjusted idle screws for max vacuum, 10", and I tried the trick of giving the secondary idle stop screw 1 turn, that didn't work. It will idle at 1600-2000 rpm, and drop to 800 in gear but I have to left foot it to keep from stalling. If I drop the idle to less than 1600, it will idle for a few seconds and go to stall, if I give it a quick shot of the accelerator, it will pick back up for a few seconds and go to die again. I set the floats right, until gas is just at the bottom of the sight glass. I am guessing I have to enlarge the idle feed restrictors, or drill the hole in the primary butterflies.
Oh yeah, this carb ran great on the factory spec 455 that came with the car when I bought it, except for blowing out the power valve. Please see my engine specs at the signature section of my posts at the bottom. Any info would be great! Thanks!
68 Firebird, 455, forged rods/pistons, 1971 #96 unported but polished heads, Holley Street Dominator intake, Q-jet for now, 1 7/8" headers, Ultradyne hydraulic cam, .231-.239@.050, .538/.558 lift with 1.65 Comp Cams roller rockers, TH350 trans, 2800 stall converter, 3.42 gears.