Thank You singscountry1967, that'* the answer I was so patiently waiting for.

Mac, that'* from Google. Mine is from YAHOO.

GoldenBullet, your reply was deleted. You are not in a very good position to be mouthing off right now, considering your current rank.

from the Denso web site :

COPPER-CORED CENTER ELECTRODE. For superior thermal conductivity.


ROD

I'm confused. On this thread I've heard over and over that plugs don't add HP, but in this thread here,

http://www.bonnevilleclub.com/forum/...ic.php?t=22893

It'* pretty much concluded that the plugs DO make a difference in power. After reading through the thread above, talking about side-gapping plugs, and looking at a pic of a Bosch+4, I see that they have this side-gap feature in them.

http://jobs.boschusa.com/AutoParts/*...latinumPlus4/#

So it seems that there are others here that are seeing improvements based on plug and / or wires.

So to make sure, I'm going to swap out to those NGK TR55s (They are only $1.77 each) and see if there is a loss in performance tomorrow. Since these Bosch+4 platinum plugs have been in for almost two months, and I'm not changing gas, O2 sensor, or anything else.. Then that should let me know if there is any difference between these plugs at all. I will NOT pull the battery to reset the emissions systems either.

If it doesn't have the same feel, then I'll know for sure that the plugs DO make a difference.

Any comments before I do this tomorrow?

Thanks!

-Chip

The difference in power is more like power RECOVERED rather than power GAINED. My experiences with the Bosch Plat +4'*... well, it'* a good thing Canadian Tire has such a lax return/exchange policy because the car ran even worse than old and worn generic plugs. AC Delco Plats went in the very next day.

sidegapping plugs has been around for over 40 years that i know of. my older brother did it to his drag car plugs in the early 60'* and i sidegap my plugs when i got my drag car in 1971(1966 Chevy Malibu). if you want or like to change plugs this is the thing to do, it EATS the ground and center electrode up in no time on a standard plug. i think i got 3 or 4 meets on a set of plugs. that is 6 to 8 passes for each meet unless i got out early, this is or was a drag car only, no street miles. i would also file and regap the plugs after the 2nd meet. now i just get the Iridium plugs put them in and forget about them for 100,000 miles(i still pull 1 or 2 plugs every 30 to 40k). the last time at 75,000 miles i had to tap the ground electrode to close the gap a little, i gap my plugs at 0.055 .

ROD

Exactly what I was thinking... it'* my understanding if you've got old plugs, you won't have the performance that you should have as with new ones. Some brands may not recover as much HP as others; but you can only recover the HP once had, not gain incremental HP.