Holley Aluminum Heads and Spark Plugs - Team Camaro Tech
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post #1 of 7 (permalink) Old Dec 31st, 08, 06:50 AM Thread Starter
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DeAngelo
 
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Holley Aluminum Heads and Spark Plugs

What is the best gap for an Autolite 3923 plug in my 9 1/2 to 1 383 engine? It is a 440 HP motor. I have it gapped at .045. Would .035 be better and why or why not? Thanks
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post #2 of 7 (permalink) Old Dec 31st, 08, 07:03 AM
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Re: Holley Aluminum Heads and Spark Plugs

ive got mine set at .045 seems to work better, ive got a 383 with dart pro1 alum heads..with msd 6al box, msd dist. and coil...my dist. is locked out...10:1 comp..100 octane fuel....tried it at .035 and at.040 but for me mine runs best at .045...every motor is built diff...trial and error...
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post #3 of 7 (permalink) Old Dec 31st, 08, 11:13 AM Thread Starter
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Re: Holley Aluminum Heads and Spark Plugs

Thx! I use 93 octane. Long story but here is the Reader's Digest version: I have a 383 with 9 1/2 to 1 compression and Holley aluminum heads that had Autolite race plugs. It worked fine. A mechanic told me to go to a warmer plug and it seemed to work but now it pings at above 3500 RPM or so when I get on it. I have regular Autolite 3923's in it now with the timing only at 11 degrees. Total is about 32 degrees with an HEI MSD distributor. I may go back to the racing plugs coz I don't worry about fouling because I don't "baby" it. Or I may go to the 3922's since they are one step colder. I hate to go through the hassle of changing the plugs if I have to do it again if the 3922's don't work. I would then go to the racing plugs. maybe I should just go straight to the racing plugs and skip going to the one step colder 3922's. Thx! DeAngelo
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post #4 of 7 (permalink) Old Dec 31st, 08, 03:42 PM
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Re: Holley Aluminum Heads and Spark Plugs

Autolite 3924 works well for me , all way around and tight quench. don't forget the anti-seize compound.

Don
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post #5 of 7 (permalink) Old Dec 31st, 08, 05:46 PM Thread Starter
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Re: Holley Aluminum Heads and Spark Plugs

Thx! Always use that stuff!
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post #6 of 7 (permalink) Old Dec 31st, 08, 05:52 PM
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Re: Holley Aluminum Heads and Spark Plugs

Quote:
Originally Posted by Deangelo66 View Post
Thx! Always use that stuff!
Sparingly I hope.A little goes a long way..you do not want this in your combustion chambers.

George
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post #7 of 7 (permalink) Old Jan 2nd, 09, 09:07 AM Thread Starter
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Re: Holley Aluminum Heads and Spark Plugs

Good point. Thx. D
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