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  1. M

    O2 sensors don't work after 0411 swap L31 Vortec

    Hi guys! So I did the 0411 swap on my 98 L31 Vortec a couple months back and recently I started the engine for the first time. The engine ran like absolute trash at idle, Would barely even start. While monitoring data with torque pro I come to find out my O2 sensors are flat-lined.....450mv (NO...
  2. M

    All the timing sets i buy are too lose

    Hi guys. Ive spent the past 3 weeks searching for a single roller timing set for my 350. all the ones i buy are way too lose. I mean so lose their ready to jump a tooth Am i the only one whos had this issue?
  3. M

    Can't find the right Timing set for crate 350. Please help!

    Hello everyone So Im working on a crate 350 right? and the timing chain is loos as hell. So I figure I'd replace everything and buy a new set. All the sets I buy are way too lose and none fit. I contacted cloyes and they said since the engine was rebuilt before it was line-honed so he told me I...
  4. M

    where do I put the O2 sensor. Before the flange or after.

    Hey guys! So im working on a project and im trying to figure out where the best place is to place the upstream O2 sensor. So my question is, it ok to put the sensor before the flange? (no holes where drilled) ive read about this on some articles and some said this will give a false reading...
  5. M

    Cannot find fuel rails for this intake manifold

    Hey guys. I found this intake manifold Accel 74139 for cheap on Facebook marketplace. But the problem is I cannot find aftermarket fuel rails for it. Can someone please help me?
  6. M

    Can't find fuel pump connector

    Hi all I'm working on a wiring harness that came from a 98 Tahoe with a L31 in it and I'm trying to find the fuel pump connector( the one that plugs into the fuel pump). I found the fuel level sensor connector but not the fuel pump connector that powers the motor. Can anyone help?
  7. M

    Can someone help me with these questions I have?

    Okay so I have a 5.7 L31 vortec engine laying around with the wiring harness on it. I 4011 swapped the black box PCM thats was originally on the harness. I want to put the engine and harness in my 1985 chevy C20 pick up but i don't know if some things will work without them. here are my...

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