Plugs 96 LT4???
Thread Starter
Instructor
Joined: Dec 2003
Posts: 103
Likes: 0
From: Stockton CA
Well I went the NGK 55s what a bear to get that number 8 plug in on the LT4. The plugs are fine but I have a DTC 301 which is a misfire on 1 and the plug is new but it looks like I have to remove the AC pump to get the new wire in????? The Os sensors on the 2 thru 8 got ride of the DTC 420 code. The prior owner put a sway bar between each wheel running in front of the water pump so there is no way your getting in there to change out the number 1 plug wire without moving this aftermarket bar which looks like a real pain to me. But I have a nasty predentation on 1 thru 7 and when that occurs the knock sencor retards the timeing and she just won't run right. 800 to 1200rpm she is a dog after that you keep the rpms up and no will catch you you shift to soon and lug the motor she will start pinging and than missing and the knock sensor tells the computer retard and it trys to get ride of the pre ignition.
Melting Slicks
Joined: Nov 2002
Posts: 2,471
Likes: 2
From: 1993 Quasar Blue 'vert Scottsdale AZ
IMHO, NGKs are the best plug ever make. I've use them in all my vehicles for the last 20 years. Right now, I'm using the Iridiums, but I don't notice much difference between them and the regulars.
Racer
Joined: May 2004
Posts: 318
Likes: 0
From: Kissimmee FL
Bosch
There's got to be a reason the Corvette race teams all use Bosch.. I've used them and highly recommend them. I can't believe the Corvette race teams wouldn't be using what they thought were the best and apparently they think Bosch is the way to go. Just my opinion....G
Race Director
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
Originally Posted by 96vetteLT4
There's got to be a reason the Corvette race teams all use Bosch.. I've used them and highly recommend them. I can't believe the Corvette race teams wouldn't be using what they thought were the best and apparently they think Bosch is the way to go. Just my opinion....G
Team Owner
Joined: Jun 2005
Posts: 46,295
Likes: 2,596
From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
Originally Posted by rmwick55
Well I went the NGK 55s what a bear to get that number 8 plug in on the LT4. The plugs are fine but I have a DTC 301 which is a misfire on 1 and the plug is new but it looks like I have to remove the AC pump to get the new wire in????? The Os sensors on the 2 thru 8 got ride of the DTC 420 code. The prior owner put a sway bar between each wheel running in front of the water pump so there is no way your getting in there to change out the number 1 plug wire without moving this aftermarket bar which looks like a real pain to me. But I have a nasty predentation on 1 thru 7 and when that occurs the knock sencor retards the timeing and she just won't run right. 800 to 1200rpm she is a dog after that you keep the rpms up and no will catch you you shift to soon and lug the motor she will start pinging and than missing and the knock sensor tells the computer retard and it trys to get ride of the pre ignition.
Matter of fact, you may be able to go to their web and find the instructions. It's a little bit of a twist and shout (epithets) to get it in, but you can leverage it up and maybe slightly out of the way for plug change.
Is that what it is?
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Cruise-In VIII Veteran
NGK TR-55 Double Platinum. Outstanding Plug. I've had mine in nearly nine months and they are very good performers.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Burning Brakes
Joined: Dec 2001
Posts: 777
Likes: 1
From: Fort Worth Texas
Originally Posted by rmwick55
Well I went the NGK 55s what a bear to get that number 8 plug in on the LT4. The plugs are fine but I have a DTC 301 which is a misfire on 1 and the plug is new but it looks like I have to remove the AC pump to get the new wire in????? The Os sensors on the 2 thru 8 got ride of the DTC 420 code. The prior owner put a sway bar between each wheel running in front of the water pump so there is no way your getting in there to change out the number 1 plug wire without moving this aftermarket bar which looks like a real pain to me. But I have a nasty predentation on 1 thru 7 and when that occurs the knock sencor retards the timeing and she just won't run right. 800 to 1200rpm she is a dog after that you keep the rpms up and no will catch you you shift to soon and lug the motor she will start pinging and than missing and the knock sensor tells the computer retard and it trys to get ride of the pre ignition.
On my 96 LT4 I use a Craftsman 3/8 drive rachet that has a 3 inch handle that will rachet up and down on a hinge so you are not on a right angle. And use a vacuum hose to start the plugs so you do not hurt the threads. T.P.I.S. (Corttrell Racing Engines) www.tpis.com use the Bosh Platuim Plus 4 and see 2 to 4 more HP gains over stock GM spark plugs on all their Racing and street Engine Packages that they sell. Check out their catalog and Dyno Charts.
Race Director
Joined: Dec 2002
Posts: 13,348
Likes: 233
From: SCMR Rat Pack'r Charter Member..Great Bend KS
Originally Posted by Sidney004
I use the cheapo Autolite copper core on my 94 LT1, which I use almost exclusively for racing. It spends most of its life between 4000 and 5700 RPM. No missing here. I change them every couple of years. They work just fine.
A spark plug is nothing more than a replaceable air gap.
That's all.
As long as it stays in one piece, the cheapest plug will give you the same performance as the trickest/four-ground/iridium/platinum/cut-back/indexed/high-dollar unit you can find. Some precious metal electrode plugs will not erode quite as quickly as the normal, nickel-alloy units, but that's about the extent of it.
That's my opinion.
Larry
code5coupe
's
