Indexing Spark Plugs - Pontiac GTO Forum
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post #1 of 3 (permalink) Old 12-23-2012, 02:01 AM Thread Starter
 
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Indexing Spark Plugs

I know there is a difference of opinion as to if there is any benefit to this or not, but I think I'll try it when I change the plugs in the spring. Different threads I've read on this give different directions. Some say to orient the gap toward the intake valve others the exhaust and one I just read said away from the combustion chamber and toward the cylinder? What's your opinions/experiences and what about the E3 spark plugs that don't need indexed?
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post #2 of 3 (permalink) Old 12-23-2012, 11:14 AM
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On a cutting edge, all-stops-pulled maximum build, perhaps a very minor gain in power. On a street driven engine, Zip. You won't feel a thing. Not worth the bother unless you "want" to. (I still mess around with points ignitions because I think it's fun). Go for it, just don't expect much.
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post #3 of 3 (permalink) Old 12-23-2012, 11:14 AM
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My opinion? I can't prove that it helps any, but it sure can't hurt. It's an easy thing to do, all it takes is a little time and patience. I indexed mine, and I pointed the "open" side of the plug towards the intake valve. It's something that race teams do, so they must think it matters.

I don't have an opinion on the E3's. I've seen side-by-side "tests" on TV where they supposedly make a difference but then those same shows usually also run ad spots for them, so I'm cautious about that.

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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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