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12:00 position Timing Tab Source?

Discussion in 'The Garage' started by Russell, Apr 11, 2006.

  1. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    hey guys!

    I bought a harmonic balancer for my truck, which was a crate engine pulloff. However, it winds up it is a 12:00 timing tab position balancer, instead of a 2:00 position tab.

    I've looked all over ebay, Summit, Jegs etc and have seen no mention of an aftermarket bolt on type tab for a 12:00 timing position.

    I know they exist, my 80 had one stock, but it was spot welded to the timing chain cover, which I recently tossed (:doah:)

    Any ideas where I can get one that is a bolt on type deal?
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Did you check GM performance parts online?

    Just an idea.
     
  3. CB77GMC

    CB77GMC 1/2 ton status GMOTM Winner

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  4. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    I would just time it with my vac gauge, but my engine is running tuned port, and I need it set at exactly 6 degrees base timing. Unfortunately, that is a far cry from where the engine will produce the best vaccum.

    Those covers seem like they might work, but at that price, I'd be best to just go find a new balancer with the 2:00 mark on it.

    I tried calling a few local stealerships, and one of them had any idea what I was talking about, and tried to sell me the 2:00 tabs, or passed me on to their service departments (like what are they gonna do about it? LOL)
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    You've got a scanner or winALDL, right?

    Just figure base timing out from that! :)
     
  6. garlicbreath

    garlicbreath 1/2 ton status

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    How do you set timing with a vacuum guage?
     
  7. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    Advance / retard the dizzy until you get your best vaccum reading, then retard it a touch until it stops pinging under heavy acceleration.

    How would a guy determine base timing based off my scanner? The ECM assumes that the timing is already set at 6 degrees initial correct?
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    I believe that some are different, but most applications from what I recall the ECM assumes timing is at base, and adds whatever is called for in the timing tables based on load, etc. Idle RPM/timing advance I would think would be pretty easy to figure out.

    I can't recall what exactly you are running for heads, but don't be surprised if it doesn't like base timing anyways. My setup certainly doesn't like the stock timing/fueling tables.
     

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