12:00 position Timing Tab Source?

[Russell]

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 ()

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

 

[dyeager535]

Did you check GM performance parts online?

Just an idea.

 

[CB77GMC]

Had same problem, Just do timing with vac gauge. There's also Harmonic Covers from jegs or summit. http://www.jegs.com/webapp/wcs/stores/servlet/CategoryDisplay?lang=-1&catalogId=10002&storeId=10001&categoryId=13301

 

[Russell]

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)

 

[dyeager535]

You've got a scanner or winALDL, right?

Just figure base timing out from that!

 

[garlicbreath]

How do you set timing with a vacuum guage?

 

[Russell]

How do you set timing with a vacuum guage?

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?

 

[dyeager535]

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.