lbrohez

I am running a holley 3310 (750 vacuum secondaries). I have a 350 (Stock LO5) (has same cam as LO3) and it has Stock rebuilt LO3 heads on it. It has about 10.3:1 compression. I have a cast iron intake manifold with a 1 inch adapter/spacer under my carb. 2 inch air horn inbetween my holley and my open element. I have a L98 exhaust manifolds, y-pipe, and I-pipe, with no cat and no muffler. It runs about 190 degress also. I am running my timing at 4 degress right now, and have a curve kit. My question is what do i need to change to get my carb to work the best on my car like what jets and power valve ect. to make it run the best, because i have my carburator leaned allmost all the way out and i still runs rich and idles betweem 750 and 1000rpms with idle turned all the way down.


Thanks in Advance

Levi Brohez.

lbrohez

can anyone help?

305sbc

iTrader: (3)

When the idle-speed screw is all the way out but the engine still idles high, that usually means a vacuum leak somewhere.

Pony Killer

just in reading that... it seems as if your timing is very low.

your base timing should be closer to 8-10 degrees, maybe more depending on your vacuum advance style.

get the timing right, then start monkeying with the carb.

i prefer to have the vacuum advance set on manifold vacuum. give you a boost of timing at idle and at highway speeds, smooths the idle out, and improves mileage a bit.

if you have it set up that way. with an adjustable vac advance can.. i like to run about 10-12 degrees of advance at idle through it.. so you've got about 20 or a bit more total at idle.

back the idle screw off a bit. start with the idle screws out 1.5 turns and start turning them in very slowly like 1/8 turn at a time.
until the idle smooths out. if it gets rougher start back at 1.5 turns and come out. till it smooths out.

if you've got a vacuum gauge it will help tune it for peak vacuum.
then drop it into gear.. foot on brakes of course and tweak it a bit to get it to idle nice nice.

lbrohez

thank you, i will try doing that, but i dont have a vacuum gauge or a automatic transmission.