I hear some people love it at 10* but Is that too far to go? Mines at Stock *6 now. BTW 89 350 TPI

 

give it a much advance as you can without triggering knock. autos trans like advance.

 

10 degrees probably isn't too much, I've seen lots of SBC's with 12 degrees, and mine is perfectly happy with 16 degrees initial.

 

The problem is, the engine does not want the same amount advance all over the rpm/load range. Adding 4* advance is going to put it in places where you don't want it, and not enough where you can use it.

Also, then you start banging against the knock sensor. Where it can end up pulling more advance out than you actually get.

Just advancing the distributor is 50 years behind the times. Do it right, do it in the eprom. We are in the 21st century now.

 

only way to know for sure is to change timing and use a dyno or ets from drag strip. you can also use a scanner to look at knock counts. each engine is differant so all you can do is trial and error approace, but still make educated guesses.

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MM Black Diamond 538 F&AM

 

Actually, automatics do not like as much advance as manuals due to the sudden load of the shifts at WOT. I have had the best results with stock timing. With the timing advanced at all, I could hear detontaion on the 2-3 shift and my E.T's were slower. I set the timing back to stock and the car ran much better. Some cars may react different than others, but the only correct way to do it is to advance the initial timing and then back off in the high end via the EProm and watch the knock counts with a scanner.

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89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph