LT4 AC Spark Plug
Thread Starter
Burning Brakes
Joined: Dec 2001
Posts: 777
Likes: 1
From: Fort Worth Texas
LT4 AC Spark Plug
Is the AC spark plug 41-943 - 25166808 the correct plug for my 1996 LT4? I have read that the plats fall of stock LT1 and LT4 spark plugs. The gap on these plugs that have 50,000 miles is .054 or so and the plug looks like it is burnig great and the car runs great. Is this plug one of the PROBLEM plugs that I have read about? As I do not see a puck, disc or plat on the electrode or the ground???T he tip on the electrode is smaller than the stock plugs in my LT1 Trans Am. Information PLEASE.
:chevy :seeya
:chevy :seeya
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
Re: LT4 AC Spark Plug (Louis Bartay)
I believe it is the possible problem plug.
I just ditched those and went with set of Rapidfires. Nearly half the cost so why not.
I was quoted #12's for hard running LT4, but normal LT1's use #14's.
:)
I just ditched those and went with set of Rapidfires. Nearly half the cost so why not.
I was quoted #12's for hard running LT4, but normal LT1's use #14's.
:)
Le Mans Master
Joined: Feb 2002
Posts: 7,858
Likes: 2
Re: LT4 AC Spark Plug (No Go)
I just ditched those and went with set of Rapidfires. Nearly half the cost so why not.
I was quoted #12's for hard running LT4, but normal LT1's use #14's.
:)
I was quoted #12's for hard running LT4, but normal LT1's use #14's.
:)
Oh yeah, the parts counter guy at one of the Advance Auto Parts stores here told me he "heard" Rapidfires aren't good in fuel injected vehicles :lol: What an idiot!
[Modified by 95_C4_convertible, 4:52 PM 4/7/2002]
Thread Starter
Burning Brakes
Joined: Dec 2001
Posts: 777
Likes: 1
From: Fort Worth Texas
Re: LT4 AC Spark Plug (95_C4_convertible)
What is the Rapid Fire part# for my LT4? I looked at the rest of my stock plugs and 5 out of 8 are missing the plat disc on the ground. :cry :chevy
Race Director
Joined: Mar 2001
Posts: 11,405
Likes: 26
From: Whippany NJ
CI 6-7-8-9 Veteran
St. Jude Donor '08-'09
NCM Sinkhole Donor
Re: LT4 AC Spark Plug (Louis Bartay)
Yes, AC Platinums are problem plugs especially if you drive your car hard.
Do yourself a favor... get NGKs V-Power (Part #TR55). Its a great performance plug and a big favorite on the forum. Gap it .050 and call it a day!
[Modified by eamador11, 11:38 PM 4/7/2002]
Do yourself a favor... get NGKs V-Power (Part #TR55). Its a great performance plug and a big favorite on the forum. Gap it .050 and call it a day!
[Modified by eamador11, 11:38 PM 4/7/2002]
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
Re: LT4 AC Spark Plug (95_C4_convertible)
Well I can't comment on the idle quality as I added a HOT cam with the RF's and the idle is not very smooth at all-I do believe it is the cam though.
My guess is for a easy LT1 or LT4 then I would use #12's, otherwise a colder plug like #14 (which I'm running).
I think Hib Halverson posted the info I have...so I trust that. It didn't hurt my new best ET so must be atleast ok:)
My guess is for a easy LT1 or LT4 then I would use #12's, otherwise a colder plug like #14 (which I'm running).
I think Hib Halverson posted the info I have...so I trust that. It didn't hurt my new best ET so must be atleast ok:)
