Spark plug questions
Thread Starter
Racer
Joined: Aug 2001
Posts: 401
Likes: 22
From: SF CA
Spark plug questions
Looking at original spec sheets for my car it says use AC 43 XL or AC R 43 XL
I see Ecklers has an AC R 43 XLS listed, is this suitable?
Also, I recall some tal on the board about AC 44's, where do they fit into the picture?
Finally, can someone tell me their experience/opinion of AC rapid fire plugs?
Thanks
I see Ecklers has an AC R 43 XLS listed, is this suitable?
Also, I recall some tal on the board about AC 44's, where do they fit into the picture?
Finally, can someone tell me their experience/opinion of AC rapid fire plugs?
Thanks
Burning Brakes
Joined: Aug 2000
Posts: 1,211
Likes: 6
Re: Spark plug questions (Chuck H.)
A/C R44XLS is slightly hotter than R43, R42,etc. The XLS part means they can be used in aluminum heads, as well as cast iron heads. Gap is standard at .035.
I think that the L-88 motor called for the R-42 plug or perhaps the R-43. You could experiment with both. I've tried the R-43 on my 427 L-36 and went back to the R-44XLS which is a good, all around plug.
I intend on trying the Rapid Fire plugs also. I think the "4" version would be a similar heat range to the 44. Also, I've read that they come standard with the new 502 crate motors.
Good luck, mark :flag :chevy
I think that the L-88 motor called for the R-42 plug or perhaps the R-43. You could experiment with both. I've tried the R-43 on my 427 L-36 and went back to the R-44XLS which is a good, all around plug.
I intend on trying the Rapid Fire plugs also. I think the "4" version would be a similar heat range to the 44. Also, I've read that they come standard with the new 502 crate motors.
Good luck, mark :flag :chevy
