AC Delco
Recommended Spark Plugs?
Thread Starter
Intermediate
Joined: Aug 2004
Posts: 37
Likes: 0
From: California
Recommended Spark Plugs?
Hello,
I just replaced the cap and rotor on my '90 today and I want to change the plugs too. Does anyone have a suggestion on a good set of plugs that don't cost a lot? Also I was wondering if all L98's have aluminum or iron heads? Thanks.
I just replaced the cap and rotor on my '90 today and I want to change the plugs too. Does anyone have a suggestion on a good set of plugs that don't cost a lot? Also I was wondering if all L98's have aluminum or iron heads? Thanks.
Le Mans Master
Joined: Jan 2002
Posts: 5,556
Likes: 0
From: Jenison MI
Cruise-In VI Veteran
Cruise-In VII Veteran
St. Jude Donor '06
I belive that you have iron heads.
As for plugs it depends on what is done to the motor.
I as do many here run NGK TR6's because of the nitrous and some run those because of SC's. But if you're not running any of that a good set of plantum plugs would be good.
As for plugs it depends on what is done to the motor.
I as do many here run NGK TR6's because of the nitrous and some run those because of SC's. But if you're not running any of that a good set of plantum plugs would be good.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
If running stock ignition components just use stock style AC Delco plugs.
If you want a little more efficient burn cut back the ground electrodes and use stock gap, details on my site.
I put on 10k miles per year and several hundred passes down the 1/4 mile so I check/regap mine every 6mo. If you don't drive a lot of miles nor drag race you might get by with checking gap every few years. For example my IROC doesn't see much highway time nor the strip these days so the cut-backs hold gap for 3-4 yrs.
If you want a little more efficient burn cut back the ground electrodes and use stock gap, details on my site.
I put on 10k miles per year and several hundred passes down the 1/4 mile so I check/regap mine every 6mo. If you don't drive a lot of miles nor drag race you might get by with checking gap every few years. For example my IROC doesn't see much highway time nor the strip these days so the cut-backs hold gap for 3-4 yrs.
Racer
Joined: Jan 2005
Posts: 476
Likes: 0
From: Tucson, AZ. L98-85 AUTO COUPE: 120k MILES: daily driver. SOUND OFF IF YOU'VE BEEN THERE. Ex-Jumpin' Junky-82nd Airborne-2/505 PIR: 1st ID-1/16th Inf: Recon Marine Retread. GOD BLESS GRUNTS.
i remember reading that some plugs come in different lengths. on a stock head you should use the ac recommended plug. i have seen after market head manufacturers recommend a specific plug brand and number for their particular head. i would assume if this info is correct, then this assures proper ignition. when purchasing aftermarket heads, it may be wise to ask which plug is recommended. now heat range is a different topic.
frog
frog
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