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Discussion Starter #1
I was watching one of the car shows that was upgrading a C4 Corvette engine. They said that if you don't change the plugs often they will seize in the aluminum heads. They also said to apply anti seize when installing new plugs. I wondered if this is true and if so how often, time wise, should they be changed in an LS6.

Thanks
 

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Anti-seize should always be used when installing plus in an aluminum head. I'd guess that when assembled, the factory uses anti-seize. I've never heard of "change the plugs often" to prevent seizing problems. I'd even venture to say that if someone actually went to the 100,000 mile change interval, it wouldn't be a major problem removing them.

Charlie
 

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remove spark plugs from aluminum cylinder heads only when the engine is cool. Since aluminum and steel expand and contract at different rates, removing spark plugs from an aluminum cylinder head while hot can actually cause thread and cylinder head damage.
 

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IT L GO said:
remove spark plugs from aluminum cylinder heads only when the engine is cool. Since aluminum and steel expand and contract at different rates, removing spark plugs from an aluminum cylinder head while hot can actually cause thread and cylinder head damage.
It sure seem to know a lot for a guy with only 14,000 posts! :lol:

Charlie
 

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I saw the same show (Two Guys Garage) and I wouldn't agree with them about routinely taking out your plugs to put new Anti-seize on the threads, but if you do take out the plugs make sure you use the Anti-seize on reassembly.
 

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Anti-seize, aluminum heads, cast iron heads, all heads, even fasteners. Anti seize is a wonderful thing if you do a lot of wrenching!
 

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Anti Seize. Use it everyday on numerous applications .I have seen(had) plugs break off in Dodge engines less than 2 yrs old(less than 20K miles). How may miles on your Z now Steve? ( The longest I would go with out removing/replacing them is 50K). I replaced mine once already ( when I installed the heads and cam).
 

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Discussion Starter #8
Baron said:
Anti Seize. Use it everyday on numerous applications .I have seen(had) plugs break off in Dodge engines less than 2 yrs old(less than 20K miles). How may miles on your Z now Steve? ( The longest I would go with out removing/replacing them is 50K). I replaced mine once already ( when I installed the heads and cam).
Hi Baron,
I have about 33K miles on it.

Steve
 

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sodian said:
Hi Baron,
I have about 33K miles on it.

Steve
Stop by the shop one Saturday and we'll pull one or two out and check them. I am sure they will be fine( and come out easy). :)
 

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Spark Plug Change

Baron

When you remove the plugs does the metal can heat shield come off as well, or first, or does it remain in place? I've not changed plugs on my '02 Z06 yet but at about 25000 mi with a fair number of track days, I'd like to inspect them and, if required, replace them with NGK Iridium TR55IX #7164 gapped to the recommended 0.060".

Thanks in advance
 

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II on 6 said:
Baron

When you remove the plugs does the metal can heat shield come off as well, or first, or does it remain in place? I've not changed plugs on my '02 Z06 yet but at about 25000 mi with a fair number of track days, I'd like to inspect them and, if required, replace them with NGK Iridium TR55IX #7164 gapped to the recommended 0.060".

Thanks in advance
The metal shield does come off with the wire. Give the wires a little twist before you try to pull them off. When re-installing I like to put a little dielectric compound( sell small tubes at NAPA) on the end of the spark plug boot and this stops the wires from sticking on the plugs. :)
 

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Do not use the copper anti-seize on aluminum heads copper and aluminum are not good friends.
Use the gray tyrp of anti-seize
 

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Spark Plug: Technical Service Bulletins Ignition System - New Spark Plug Type/Gapping
Bulletin No.: 03-06-04-060
Date: October 24, 2003
INFORMATION
Subject:
Information on New Spark Plugs and Gapping
Models:
2004 Buick Ranier
2002-2004 Cadillac Escalade, Escalade EXT
2003-2004 Cadillac Escalade ESV 2004 Cadillac CTS-V
1997-2004 Chevrolet Corvette
1998-2002 Chevrolet Camaro
1999-2004 Chevrolet Silverado
2000-2004 Chevrolet Suburban, Tahoe
2002-2004 Chevrolet Avalanche
2003-2004 Chevrolet Express, TrailBlazer
1999-2004 CMC Sierra
2000-2004 CMC Yukon, Yukon XL
2001-2004 CMC Yukon Denali, Yukon XL Denali
2002-2004 CMC Sierra Denali
2003-2004 CMC Envoy XL
1998-2002 Pontiac Firebird
2004 Pontiac GTO
2003-2004 Hummer H2
with 4.8L, 5.3L, 5.7L or 6.0L V-8 Engine (VINs V, P, T, Z, G, S, N, U - RPOs LR4, LM4, LM7, L59, LSI, LS6, LQ9, LQ4)
A new spark plug has been released for use in the above vehicles. The new spark plug has an Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed. The new spark plug, P/N 12571164 with AC Delco P/N 41-985, is gapped to 1.01 mm (0.040 inches) when the spark plug is made. The spark plug gap is set during manufacturing and should not be changed or damage to the spark plug may result. Any new spark plug found to not be properly gapped should not be used.
 
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