Spark Plugs

[karr95]

I have a 1991 GTA with the 350 TPI. The car has 109,xxx on the clock and I want to change the spark plugs considering I have no idea when they were last done. The car is bone stock except for an SLP Loudmouth 2 exhaust. Which plugs should I get? As a reference, this is a weekend car, I don't beat on it and it is driven less than 7500 miles per year. Also, I am running manifolds with that A.I.R. crap so I don't wanna have to worry about these things.

50-R5724-8 NGK Racing R5724-8 Spark Plugs, three heat ranges colder than stock, gapped at .032 $2.25 Buy Wish


50-R5724-9 NGK Racing R5724-9 Spark Plugs, four heat ranges colder than stock, gapped at .036 $2.25 Buy Wish


50-TR5 NGK TR5 Spark Plugs, Stock heat range, gapped at .035 $2.25 Buy Wish


50-TR55 NGK TR55 Spark Plugs, Stock heat range, gapped at .050 $2.25 Buy Wish


50-TR55-IX NGK TR55-IX Iridium Spark Plugs, Stock heat range, gapped at .050 $6.99 Buy Wish


50-TR6 NGK TR6 Spark Plugs, One heat range colder than stock, gapped at .035 (Works well in Nitrous, Supercharger, or High-compression motors) $2.25 Buy Wish


50-UR4 NGK UR4 Spark Plugs, Stock heat range, gapped at .035 $2.25 Buy Wish


50-UR4-IX NGK UR4-IX Irrdium Spark Plugs, Stock heat range, gapped at .035 $6.00 Buy Wish


50-UR5 NGK UR5 Spark Plugs, Stock heat range, gapped at .045 $2.25 Buy Wish


50-UR5-IX NGK UR5-IX Irridium Spark Plugs, Stock heat range, gapped at .045 $6.99 Buy Wish


50-FR4 NGK FR4 Spark Plugs, Stock heat range, gapped at .035 $2.25 Buy Wish


50-TR6-IX NGK TR6-IX Iridium Spark Plugs, One heat range colder than stock, gapped at .035 (Works well in extreme conditions, such as Nitrous, Supercharger, or High-compression motors)

Thanks!

[Tru2Chevy]

I would say to just go to the parts store and grab stock heat range AC Delco's. No need for anything fancy.

- Justin

[BonzoHansen]

I would say to just go to the parts store and grab stock heat range AC Delco's. No need for anything fancy.

- JustinYes, why change heat ranges? I've had good success with NGKs in the past as well.

[karr95]

I was told I should run these:

50-UR4-IX NGK UR4-IX Irrdium Spark Plugs, Stock heat range, gapped at .035 $6.00 Buy Wish

They are the iridium ones so they are good for 100K under normal driving conditions. I have a few weeks before it starts to warm up for me to do this so I'll keep researching.

You guys have any expierience with the fire sleeves? Since I am sticking with the manifolds I heard these are a good idea as well.

Thanks

[bubba428]

in that motor iridium is about as worthless as **** on a bull...$1.48 autolites will run better...and if you don't like autolite get delco...no ngk...

[karr95]

in that motor iridium is about as worthless as **** on a bull...$1.48 autolites will run better...and if you don't like autolite get delco...no ngk...

Why won't they run well? I thought NGK's were the best?

[NJSPEEDER]

the brand and style of plug does not make a dramatic difference in performance unless there is something else in play to effect the spark efficiancy. if you did a major upfit on your ignition, like to a 16volt system, or had boost/spray going through it, then you would have conditions that coudl show a difference between styles and brands.
if you jsut want to do a tune up, get the regular ac delco/autolite plugs from the parts store.

[BonzoHansen]

we used to stock autolite plugs. autolite ftl

[Savage_Messiah]

either get the normal crap or tr55's

[WildBillyT]

Regular heat range, stock plugs. Either Delco or Autolite.

[Batman]

For a stock engine I would just get stock plugs. Personally I like NGK, but for such a mild engine it won't make much difference.

[camaro2you]

I run delcos in the older motors, aluminum lsx motors i run ngk's and vortecs i run the 5buck delco plugs.

[karr95]

Thanks for all the replys guys. It looks like I will not be going after the iridium plugs. I guess I will just go with the delcos.

Thanks!