AC Delco spark plugs for LT1?
Thread Starter
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
AC Delco spark plugs for LT1?
I know there was one of the threads that polled owner's preferences for spark plugs, and I responded with the Delco copper plug I was using. Other owners were using the sAme plug then. That thread was over 4 years old and is not in the archives.
Does anyone know the regular Delco copper plug that is equivalent to the NGK TR55? I think what I'm looking for is R44TS or R44TLS.
I have given up and ordered NGK TR55 to get me through an emissions inspection right now. I currently am using NGK TR6 but they foul in Washington Beltway traffic, so I have to switch. I would like to know the AC Delco plug part number because I got good service with them in the past.
Between fighting with Autozone and driving to Advance Auto stores that have closed this thing is beginning to be a major frustration.
Does anyone know the regular Delco copper plug that is equivalent to the NGK TR55? I think what I'm looking for is R44TS or R44TLS.
I have given up and ordered NGK TR55 to get me through an emissions inspection right now. I currently am using NGK TR6 but they foul in Washington Beltway traffic, so I have to switch. I would like to know the AC Delco plug part number because I got good service with them in the past.
Between fighting with Autozone and driving to Advance Auto stores that have closed this thing is beginning to be a major frustration.
Last edited by FELNGR8; Jun 26, 2007 at 08:42 PM.
Melting Slicks
Joined: Feb 2006
Posts: 2,240
Likes: 0
From: Cleveland OHIO
It really doesn't matter, plugs are plugs. As long as you aren't going to put them in and try to leave them in for 50K miles or more buy whatever is on sale. I love all the stock cars that just have to have high dollar wires and the most $$ plugs they can find. Add to that a $50.00 air filter and you still have 300chp.
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
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Cruise-In VIII Veteran
For AC/Delco you want AC Delco Part # 41-904 (Platinum) or 14 (Rapidfire).
If you've already installed the NGK TR-55 Double Platinum, you've got an outstanding plug and are good-to-go.
That's what I currently have in mine and they have been excellent for 13,000 miles.
If you've already installed the NGK TR-55 Double Platinum, you've got an outstanding plug and are good-to-go.
That's what I currently have in mine and they have been excellent for 13,000 miles.
Melting Slicks
Joined: Feb 2005
Posts: 3,204
Likes: 4
From: Midland Georgia
St. Jude Donor '06
Ngk
Interesting this should come up... I had a plug and wire changing party at my house a few changing party at my house with 02 Vette (friends) 02 Yukon and a 94 Vette.
"Plugs are plugs", I used to think so, but no longer. I put Bosch +2 plugs in my 94 LT1, 02 Yukon and the 02 vette... They caused monster misfires in the Yukon and C5. The Yukon could not be driven #6 was dead! Misfire in #8 on the C5 and a bad stumble in the C4... I went back to AC Delco Iridium (Factory Spec) in the Yukon and C5 and NGK in the Vette and the misfires are totally cured! BTW the plugs I pulled out of my Yukon were labeled AC Delco on one side and NGK on the other!!!
"Plugs are plugs", I used to think so, but no longer. I put Bosch +2 plugs in my 94 LT1, 02 Yukon and the 02 vette... They caused monster misfires in the Yukon and C5. The Yukon could not be driven #6 was dead! Misfire in #8 on the C5 and a bad stumble in the C4... I went back to AC Delco Iridium (Factory Spec) in the Yukon and C5 and NGK in the Vette and the misfires are totally cured! BTW the plugs I pulled out of my Yukon were labeled AC Delco on one side and NGK on the other!!!
Thread Starter
Melting Slicks
Joined: May 2002
Posts: 2,670
Likes: 4
From: Severna Park MD
It really doesn't matter, plugs are plugs. As long as you aren't going to put them in and try to leave them in for 50K miles or more buy whatever is on sale. I love all the stock cars that just have to have high dollar wires and the most $$ plugs they can find. Add to that a $50.00 air filter and you still have 300chp.
Race Director
Joined: Oct 2001
Posts: 19,653
Likes: 428
From: Melbourne Florida
Cruise-In IV Veteran
I run the basic "el cheapo" plugs in mine and have had no problems in 4 years...I use Autolite's that cost like $9 for all 8 plugs...I gap mine tight ot .030 since I drag race it over 90% of the time...I change them about every 2.5 years and they always look like new...
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