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Original spark plug

This is a discussion on Original spark plug within the General Help forums, part of the LSx Technical Help Section category; I pulled a plug last night on my 98 WS6 TA that just turn over 100k miles. The number on ...

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    Original spark plug

    I pulled a plug last night on my 98 WS6 TA that just turn over 100k miles. The number on the plug is 41-931. Are these the original plugs?
    I have searched the board for an hour and could not find anything.
    Also, what is the best deal for plugs and wires.

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    TJEA Retirement Home Dr.Crash's Avatar
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    Im not sure on the original plugs. TR55's are a great replacement with some MSD wires. check with our site sponsors, they should be able to get you a pretty good deal

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    Single Malt rbob93's Avatar
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    I don't think they make a 41-931 anymore, but I could be wrong.

    If you don't mind changing them, TR55's.

    If you want them to stay in for awhile use the TR55IX which is iridium. Do not gap iridiums to factory specs though. They are gapped at .040 & should stay there.

    Ignition cables? Being so short they're anyone's guess.
    Comes down to whose pocket you wanna fill or whose advertising you wanna believe.

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    I have been reading about the TR55's, probably going with them and a set of MSD wires. If there is a sponsor reading, let me know what you have.

    just found my manual and it states the AC Delco plug 41-931, so it looks like they are the original plugs. There was not much left on the tip after pulling one last night. It did not say what type of plug they are. See below.

    Maintenance Items
    Maintenance Items Usage
    Type

    Air Cleaner

    3.8L (L36) and 5.7L (LS1)
    AC Type A1163C

    Engine Oil Filter


    3.8L (L36)
    AC Type PF-47

    5.7L (LS1)
    AC Type PF-44

    PCV Valve

    3.8L (L36)
    AC Type CV892C

    5.7L (LS1)
    AC Type CV895C

    Spark Plugs and Gaps

    3.8L (L36)
    AC Type 41-921

    (GAP 1.52 mm, 0.060 in)

    5.7L (LS1)
    AC Type 41-931

    (GAP 1.52 mm, 0.060 in)

    Fuel Filter

    3.8L (L36) and 5.7L (LS1)
    AC Type GF-578

    Radiator Cap

    3.8L (L36) and 5.7L (LS1)
    AC Type RC-24



    --------------------------------------------------------------------------------
    Document ID# 232792
    1998 Pontiac Firebird

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    Just got back from Advance Auto parts store could not find TR55's. Is there another part number or something.

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    Single Malt rbob93's Avatar
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    NGK 3951 is NGK TR55.....try that

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    Cool, thanks

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    Go Vols! x10-wakerider's Avatar
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    Quote Originally Posted by rbob93 View Post
    Do not gap iridiums to factory specs though. They are gapped at .040 & should stay there.


    Mine are AC delco iridiums and I put the gap at 0.060 inches (factory)!

    am I in trouble?

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    Quote Originally Posted by x10-wakerider View Post
    Mine are AC delco iridiums and I put the gap at 0.060 inches (factory)!

    am I in trouble?
    No.....I don't think the plug police are going to find you.

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    I lika da Chevy's LETHALxLS1's Avatar
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    Quote Originally Posted by x10-wakerider View Post
    Mine are AC delco iridiums and I put the gap at 0.060 inches (factory)!

    am I in trouble?

    I am unsure about the iridiums but my tr55's are gapped at .035 and it runs like a champ. I think .060 is too large of a gap for these engines.

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    Single Malt rbob93's Avatar
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    Quote Originally Posted by LETHALxLS1 View Post
    I am unsure about the iridiums but my tr55's are gapped at .035 and it runs like a champ. I think .060 is too large of a gap for these engines.
    The gap for the AC Delco iridiums is 1.01mm or .040

    The gap for the platinums is .060

    Our ignition systems were made to fire a .060 gap with no problem

    .035.....I never ran it but if it works

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    Member blk99ws6ta's Avatar
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    Quote Originally Posted by HUNTNFISH View Post
    I pulled a plug last night on my 98 WS6 TA that just turn over 100k miles. The number on the plug is 41-931. Are these the original plugs?
    I have searched the board for an hour and could not find anything.
    Also, what is the best deal for plugs and wires.
    They may have something like paint on the end, then maybe they are your original ones. I had paint on mine. I took them to a shop to show them. They said it could be the original plugs from the factory. I changed mine at 125K. Good luck getting to your 8th plug.

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    Senior Member Danger731's Avatar
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    ^ lol

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    We'll be back... GatorSS's Avatar
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    Quote Originally Posted by blk99ws6ta View Post
    Good luck getting to your 8th plug.
    It is easy to access it from underneath.

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    Got them in yesterday, took me three hours. That was including changing the oil and filter. Plus going inside to cool down and get another beer. The gaps on the orignal plugs were .90 to .65. She runs alot better on the way to work this morning. I removed the coil packs on the passenger side to change no. 8 plug.

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    Single Malt rbob93's Avatar
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    Quote Originally Posted by HUNTNFISH View Post
    Got them in yesterday, took me three hours. That was including changing the oil and filter. Plus going inside to cool down and get another beer. The gaps on the orignal plugs were .90 to .65. She runs alot better on the way to work this morning. I removed the coil packs on the passenger side to change no. 8 plug.
    Not bad at all!

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