spark plug
Le Mans Master
Joined: Jan 2007
Posts: 7,877
Likes: 3,277
From: Omaha NE
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2022 C3 of the Year Finalist - Unmodified
2020 C3 of the Year Finalist - Unmodified
About 3 or 4 years ago I went with NGKs for the first time and I love em. My Vette had a smoother idle then it ever had and it ran great. I think they were around 3 or 4 bucks each but well worth it...
Melting Slicks
Joined: Mar 2007
Posts: 2,100
Likes: 12
From: Frederick Maryland
Personally, I've never seen any difference in plugs. Years ago I worked in a JC Penney auto center (before they did away with them), and used Penney brand plugs (made for them by Prestolite). I never saw any difference in performance or how long they lasted. The secret is to get the right heat range application.
One mechanic friend at the time swore by Champions for a small block and AC plugs for a big block. That was his preference. He also raced and based his obervations on that.
My Corvette friends all seem to agree that AC Delco is the way to go, regardless of what year or model engine.
That really clears it up, doesn't it?
One mechanic friend at the time swore by Champions for a small block and AC plugs for a big block. That was his preference. He also raced and based his obervations on that.
My Corvette friends all seem to agree that AC Delco is the way to go, regardless of what year or model engine.
That really clears it up, doesn't it?
Melting Slicks
Joined: May 2002
Posts: 2,716
Likes: 121
From: Sulphur LA
St. Jude Donor '05-'06,'11,'13-'14,'16,'18,'19,'24, '25
Spark plugs are critical, I’ve been tuning my vette for the last few months, I had a set of Bosch plugs in it, and I had to make sever mods to the carb to get it to run somewhat ok. The O2 meters were all over the place, pulled the plugs to find them fouled with soot. I did some research on the net to find that NGK is one of the highest ranked plugs for performance with AC Delco Rapid-Fires right up there with them. So I put some AC plugs in and what a difference they did make, now I have to go back and retune the carb all over again. In our small outboards we would see 200 to 300 RPMs just with a plug change to NGK V-groove plugs. So to answer your question I would suggest using AC Delco rapid-Fire plugs, I can personally testify to how big a difference they made in my motor, or NGK plugs.
Neal
Neal
