427/400 (L68) spark plug-alternatives
Thread Starter
Racer
Joined: Aug 2000
Posts: 349
Likes: 1
From: Hofheim Germany
427/400 (L68) spark plug-alternatives
Hi over there,
in my '69 Vette with L68-motor (427/400) I use AC-Delco spark plugs (R43XL as I remember).
Now I guess, wether there are better alternatives for these plugs, probably as platinium-plugs or something else - which guarantee a performance at least as good as the AC-Delco plugs.
Has anyone of you made any expieriences with alternative plugs? Is there any "certified" recommendation for such plugs?
Thanks for your help from over the pond
Gerrit
in my '69 Vette with L68-motor (427/400) I use AC-Delco spark plugs (R43XL as I remember).
Now I guess, wether there are better alternatives for these plugs, probably as platinium-plugs or something else - which guarantee a performance at least as good as the AC-Delco plugs.
Has anyone of you made any expieriences with alternative plugs? Is there any "certified" recommendation for such plugs?
Thanks for your help from over the pond
Gerrit
Team Owner
Joined: Jul 1999
Posts: 26,545
Likes: 46
From: Huntersville NC
Originally Posted by Ironcross
The 43`s may be too cold, move up to a R45XLS for better all around performance.
I think I have 44s in there right now. But to tell you the truth I doubt you will notice any real difference.
Thread Starter
Racer
Joined: Aug 2000
Posts: 349
Likes: 1
From: Hofheim Germany
Hi - tanks for your answers so far.
I forgot to say, that I've disfunctioned the K66 transistorized ignition and replaced it with another breakerless system (no high-voltage).
My plan was to replace the copper-lined plugs with platinum substitutes. So I want to know, wether there are platinum-plugs wich I can use as replacement.
Gerrit
I forgot to say, that I've disfunctioned the K66 transistorized ignition and replaced it with another breakerless system (no high-voltage).
My plan was to replace the copper-lined plugs with platinum substitutes. So I want to know, wether there are platinum-plugs wich I can use as replacement.
Gerrit
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
Melting Slicks
Joined: Jun 2001
Posts: 2,340
Likes: 2
From: Moro IL
The problem with most platinum plugs in carberated applications is they tend to fuel foul easy. Not a problem with EFI engines but something easy to do with a carb engine. I tend to like to keep fairly close tabs on my engine and do a yearly plug change on the vettes as part of their normal maintenance, and it gives me a chance to catch some problems early before they become a big problem (too rich, too lean, oil control issues). So I recommend sticking with your regular copper plugs. I've run A/C's and NGK's on my big blocks without any issues.
Pat Kunz
Pat Kunz
