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Old 09-28-2006, 08:56 PM
72NOVA454
 
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Chevy 454 Spark Plugs Selection Help

Help

let's pretend a "friend of mine" has just rebuilt his 454 (actually a 468) BB Chevy street/strip car and needs some spark plugs. The block is from a 79 chevy truck and the oval port iron heads from a 69-70 passenger car. Compression is approximately 10:1. He has MSD capacative discharge "CD" ignition, headers, long duration cam, etc.

what spark plug do I start with?

My "friend" currently has the AC-Delco R45XLS plugs in there now. The motor runs fine - so it appears, but I believe there is a more correct plug for the application. I think the plugs are running hot. Where do I begin the process of plug selection? Lets just say a performance 454 Chevy just showed up at your front door one day (yea right !) with no spark plugs in there. what would you do to select the right plug?

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Old 09-28-2006, 10:20 PM
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leejoy, as I recall most standard performance big block chevys that use the large gasketed plug, used a AC 43N plug. Since these aren't made anymore, the XLS series is what is sold as a replacement. The high performance engines (L-72, L-88, etc.) used the 42N or 42XLS (fully threaded) in aluminum heads. Try the 43XLS and check your plugs to see what they look like after a few full power runs. That's what I would do to my door step 454.
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Old 09-28-2006, 10:28 PM
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I'm currently running autolite 144 plugs in my 454 right now.
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Old 09-28-2006, 11:29 PM
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I`m with bigblock454camaro...

Run the Autolites or the same plug in Motorcraft... I`m a Chevy person all the way except for the plugs... BBC`s and AC Delco just dont get along all that well...
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Old 09-29-2006, 03:14 AM
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Chevy 454 Spark Plugs Selection Help

All I've been using in my LS-6 big block are AC Delco R 43-T plugs for the last 5 years,they seem to work just fine,although they get replaced every year.
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Old 09-29-2006, 05:26 AM
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Quote:
Originally Posted by topfuel
leejoy, as I recall most standard performance big block chevys that use the large gasketed plug, used a AC 43N plug. Since these aren't made anymore, the XLS series is what is sold as a replacement. The high performance engines (L-72, L-88, etc.) used the 42N or 42XLS (fully threaded) in aluminum heads. Try the 43XLS and check your plugs to see what they look like after a few full power runs. That's what I would do to my door step 454.
thanks buddy. I'll do that.
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Old 09-29-2006, 05:29 AM
72NOVA454
 
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Quote:
Originally Posted by bigblock454camaro
I'm currently running autolite 144 plugs in my 454 right now.
I will try to compare the heat range of that plug to my current plug, then make a decision.
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Old 09-29-2006, 07:04 PM
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454 plugs

In the Chiltons auto repair manual 1969 to 1976 it states that a 1971 454 takes a r-42ts plug, 1972 takes a r-44t,up untill 1974. A1970 454 takes a r-44t.
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Old 09-29-2006, 08:07 PM
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Quote:
Originally Posted by chevmal
In the Chiltons auto repair manual 1969 to 1976 it states that a 1971 454 takes a r-42ts plug, 1972 takes a r-44t,up untill 1974. A1970 454 takes a r-44t.
that's the kind of info I was looking for. Thanks buddy. I will also check on the gap - it may be .035" I think.
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Old 09-29-2006, 08:41 PM
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Quote:
Originally Posted by chevmal
In the Chiltons auto repair manual 1969 to 1976 it states that a 1971 454 takes a r-42ts plug, 1972 takes a r-44t,up untill 1974. A1970 454 takes a r-44t.
dear ChevMal

can you check the book again and see what plugs are used for a 1969-1970 chevy 396 or 427? (101 cc comb chamber)

thanks buddy.
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Old 10-01-2006, 09:37 AM
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Leejoy-454

Leeyjoy, e-mail at chevmal@aol.com
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Old 10-01-2006, 09:47 AM
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Leeyjoy-plugs

The 1969 427 big block rated at 335 hp takes a r44n pulg. With 390 hp takes a r43n. The 1970 454 with 345 hp takes a r44t.With 390 hp takes a r43t. Al
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Old 10-02-2006, 12:05 AM
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Quote:
Originally Posted by chevmal
The 1969 427 big block rated at 335 hp takes a r44n pulg. With 390 hp takes a r43n. The 1970 454 with 345 hp takes a r44t.With 390 hp takes a r43t. Al
I learned there are 2 different size (length) plugs for this application. It is tricky. My heads are from a 1969-1970 passenger car per the casting number. the block is a 1979 chevy truck. I need the plugs with the "long" threaded portion not the "short". I went to a parts store and had them show me a bunch of plugs. I finally got it figured out. I went with the AC-Delco R43XLS plug. It was not easy to choose. the computer showed at least 15-20 different plugs available. the plug I got is the same size physically as the plug I was running but with a lower heat range. My old plugs were the R45XLS and were "hotter". Also the new plugs have a gap at .035" per the computer listing while the older plugs were gapped at .025" which I believe was incorrect.
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