Which plug do you run?

I'm running Firestones but only because they were in it when I bought it. They run fine so far I've driven maybe 1500 miles.
I'm going to put in the Repo Champion 3X's soon.
 
duke36 said:
The Champion #518 (W18) run nicely in h.comp. heads at .030/.032
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Duke, since I installed my 5.5 head it seems to run rich with 3X (No other changes). Did you find the same? and that is why you run the W18's. I was thinking of trying the W18. Thanks
 
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See Larry Brumfield post of 6-29-10 for info. on plugs.
YBlock, our 5.5 w/ W18's (new no. 518) runs a nice tan color and the price is right per plug. We ran TT10's for awhile and the car likes the 518's with a Marvel carb. Note this is w/ FS zipper ignition which we're going to change back to modern points due to advance issues on hills and see how that works. Also, I use small amounts of lead substitute and ethanol stabilizer in gas (but not sure how much effect that has.).
 
Lot's of discussion/opinions about heat range, etc. We tried different plugs we had on hand to see what works for our set up, so others may have different experiences.
 
ANYTHING with the right heat range & burns CLEAN!
There are NO "MAGIC" Spark plugs!
Driving with "GUSTO", helps to keep plugs running CLEAN.
LOOOONG idling sessions crap them up.
Bill Smooth
 
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