Spark plugs - Team Camaro Tech
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post #1 of 34 (permalink) Old May 3rd, 13, 06:35 AM Thread Starter
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Question Spark plugs

Wanted to get a little better spark plug Boot clearance from my headers . So the parts store was shoked that I ran Autolite 3924 plugs and sold me Accel 576S Header Plugs. They are a little shorter but have HALF the threads. Seems that they will not go as deep into the heads, So can I use thease Accel plugs? or am I worried for nothing ??

Mike , Mountain Green,67R/S , 350 ,T400 , A/C
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post #2 of 34 (permalink) Old May 3rd, 13, 08:04 AM Thread Starter
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Re: Spak plugs

Sorry about the spelling in my post , any way thanks in advance

Mike , Mountain Green,67R/S , 350 ,T400 , A/C
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post #3 of 34 (permalink) Old May 3rd, 13, 08:31 AM
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Re: Spak plugs

If the plugs don't protrude into the combustion area as intended, you don't get the proper flame pattern / complete burn. I would not use, unless they are recommended by the cyl head manufacturer (if you have aftermarket heads). I am sure others will chime in soon. Another concern would be the heat range of the new plug. JMO
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post #4 of 34 (permalink) Old May 3rd, 13, 09:03 AM Thread Starter
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Re: Spak plugs

I have Dart heads,plugs are straight,not angled. I told the parts this and my concerns with plugs,says they will work. I just want to be shure. I have some work to do before I am ready to start her up.

Mike , Mountain Green,67R/S , 350 ,T400 , A/C
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post #5 of 34 (permalink) Old May 3rd, 13, 05:24 PM Thread Starter
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Re: Spark plugs

I guess I'll stay with the same plugs that I have been using. I will try and find the build sheet on my motor and Identify what Dart heads I have ,They look like Iron Eagle SS , but I don't remember, it was built in 2005. I was just trying to get better plugs,thanks mike

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post #6 of 34 (permalink) Old May 3rd, 13, 05:56 PM
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Re: Spak plugs

I had same issue with the plug wires and headers....I went with AR series Autolites...shorty plugs

What plugs were you running ?

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post #7 of 34 (permalink) Old May 3rd, 13, 06:05 PM Thread Starter
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Re: Spark plugs

Have been useing Autolite #3924 , parts store wants me to try Accel 576S ,but they look wrong to me, and I do not want damage anything.Thanks for the reply

Mike , Mountain Green,67R/S , 350 ,T400 , A/C
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post #8 of 34 (permalink) Old May 3rd, 13, 06:28 PM
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Wink Re: Spak plugs

Mike, the Autolite 24 (or 3924) series are 14mm gasketed seat with @.750" "Reach" (or the threaded into head part).
The shorties he sold you sound like the standard Chevy head Tapered seat units that are @.460" - he probably didn't get the whole aftermarket head thingy
Are they tapered or gasketed seal?
It is important to get the correct reach - or you won't get the best combustion or you will get mechanical interference ...

Be aware Dart changed the spark plug type they used somewhere along the way, as I had a couple Iron heads bought at different times that had different plug holes (both 200 types) - had to find another to get the set to match ...

Google some of the plug manufactures sites and look through their spec.s page(s) for actual discription and measurements for different plug types.

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post #9 of 34 (permalink) Old May 3rd, 13, 06:35 PM
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Re: Spak plugs

Depending on the auto store, I wouldnt trust what they tell you. Me and my buddy had a parts counter guy tell us we needed 2 front drive shafts for an 85 Chevy pickup. LoL.
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post #10 of 34 (permalink) Old May 3rd, 13, 06:46 PM
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Re: Spak plugs

You need to contact Dart or look them up on-line. I have Edelbrock Performer RPM heads and they recommend Champion RC12YC. If you look these plugs up youll find them in many lawn mowers, and small engines.

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post #11 of 34 (permalink) Old May 3rd, 13, 06:48 PM
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Re: Spak plugs

Checkout the P526S Accell U-Groove "Shorty" Double Platinum Header Plugs. They are approximately 3/16" shorter. They are a tapered plug with .75" reach. So I've heard.
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post #12 of 34 (permalink) Old May 3rd, 13, 07:00 PM Thread Starter
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Thumbs up Re: Spark plugs

OK I found some paperwork on my engine. Dart Performance Pro One Aluminum Heads.64 cc with 200cc Intake runners . 2.02 Intake valves. Exhaust Valves 1.60 .Originaly had AC delco plugs. I will check out Dart on line.Thanks

Mike , Mountain Green,67R/S , 350 ,T400 , A/C
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post #13 of 34 (permalink) Old May 3rd, 13, 07:01 PM
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Re: Spak plugs

I have one plug that is tight on a 1 5/8" Dynatech header tube. I went through a few options searched the net endlessly and this is the best solution I've found:

14mm 3/4 reach, gasket plug same heat range I need:
http://www.summitracing.com/parts/ngk-4753

Snip the end off your plug wire and thread this cap on:
http://www.ngk.com/product.aspx?zpid=20169
Amazon shows a different pic but it's the right one:
http://www.amazon.com/NGK-TRS1225-Resistor-Spark-Plug/dp/B0018JSKHC/ref=sr_1_1?ie=UTF8&qid=1367632249&sr=8-1&keywords=trs-1225
Viola about 3/4" of clearance now. The plug cap is a quality unit. It has a threaded "spire" to thread into the plug wire and is completely re-usable.


Check it out!
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post #14 of 34 (permalink) Old May 3rd, 13, 07:04 PM Thread Starter
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Thumbs up Re: Spark plugs

SilverSS1969 , I didn't trust the parts sailsman Thats why I came here

Mike , Mountain Green,67R/S , 350 ,T400 , A/C
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post #15 of 34 (permalink) Old May 3rd, 13, 07:50 PM Thread Starter
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Question Re: Spark plugs

OK I checked out Dart on the web. I found on their speck pages , AUTOLITE AR133 is what they show, man they look like the ACCELL plugs that the want sell me.I am confused..info was found on the Iron Eagle specks

Mike , Mountain Green,67R/S , 350 ,T400 , A/C
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