Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

emissions?changeing jets

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by lgk5, Jan 18, 2002.

  1. lgk5

    lgk5 1/2 ton status

    Joined:
    Apr 3, 2001
    Posts:
    269
    Likes Received:
    0
    Location:
    slc,ut.u.s.a
    alright tell me if this sounds right.
    new gm crate stock 350 3640miles
    new edelbrock q-jet #1904 794cfm
    oh yeah 83 gmc jimmy
    new cat today
    test /rpm / hc(ppm)/max / ave / measured/co% max / ave/m
    15mph 1349 370 56 102 2.90 .37 4.59
    25mph 2160 330 37 54 2.81 .31 3.37
    ^
    they said to jet it down to .071
    ok i asume this is right how hard is it to jet down a q-jet
    any help would be greatly appreciated
    by the way those rpms 4.56 & 33"tires
     
  2. Hossbaby50

    Hossbaby50 3/4 ton status

    Joined:
    Sep 1, 2001
    Posts:
    8,972
    Likes Received:
    0
    Location:
    Peoria, AZ
    Get your carb dialed in to you motor first. Then when you take the e test again make sure your cat is HOT. Real hot. I ran my truck on the freeway for 20 mins in drive at 75, went to the e test, sat in line at a high idle to help keep the cat hot. When I was next in line to go in, I revved the motor to 3000K RPM (estimate) to get the cats as hot as possible. I passed with flying colors. (300Hp crate 30K, MSD ignition, dual exhaust with dual cats, factory Qjet)

    My Chevy isn't broken, its just out of gas.
     
  3. lgk5

    lgk5 1/2 ton status

    Joined:
    Apr 3, 2001
    Posts:
    269
    Likes Received:
    0
    Location:
    slc,ut.u.s.a
    thanks ,i'll do it
    if your truck came with duals from the factory then i should be able to put it on mine,right?

    <P ID="edit"><FONT class="small">Edited by lgk5 on 01/19/02 07:31 AM.</FONT></P>
     

Share This Page