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mr p i'm sorry i great respect for you ,,
but this is just plain outright b s ,
as i have posted before, you cannot gain up to 10 hp
over any plug by autolites, plugs,,
not unless that plug not firing, or is in the wrong heat rang
indexes is not what it all is either, yes min gain and the work to do it , yes some motors you have to index,
sometimes yes 7-10 hp doesnt take alot for a motor to pick that up,
air quality, wind,
when its on a dyno, and that statement comes out i will go back
and say, that the plugs are bad, just as a set of wires can have to much resitance and have the same effect,
other than delivering the ign to fire that cyl, thats what the plug will do
my testing has come from the track,i have used 100s of plugs ,at the track & on my own, i have used autolites, motorgraft, ngk champion, bosch, ac delco, i have yet to see any plug, pick up over the other !
i have run gas and now alcohol, i have change plugs at will, on both
yet to see even so much as a hundreth of a pick up,
if a guy has a gas fouled , oil fouled ,etc plugs yes he will see a pickup yes even on a dyno,

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If David Vizard's input is of any value on this subject, here's something I found when he was testing a different brand of plugs than Autolite:

"Up to this point, an Autolite plug had consistently out-powered everything else we tried... The baseline Autolite plugs used in the test produced two more horsepower (but sometimes more) than most other plugs we tested. However, plug testing can reveal some unexpected results inasmuch as one or two brands that work perfectly in a similar engine don’t pass muster and could be as much as 10 hp down."

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All I can add is that when I did back-to-back tests between the standard Autolite and the AR series in the same heat range, my car picked up about .5 MPH w/ no other change.

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are you saying there is no truth to my statement? thats just my experience,, ive done it a few times on my dyno and its always worth power

in a ss hemi gained 10
in a ss 427 chevy gained 10
in a pump gas small chevy gained 6
in a 480 cubic inch fe pump gas was worth 8
in a 505 bb mopar pump gas was worth 6

all average power numbers which is all i ever look at

so i built a small blk ford motor for a guy local who works for the prince of quatar(alanabi guy),, so he is hooked up with shannon jenkins from some nitrous company,, i told my customer to run autolite plugs but they didnt cause they later told me i didnt tell them a part number,,, so they ran ngk,, so they went down south and shannon told them to go to the store and get some autolite plugs cause they make more power than ngk plugs,,, so they did cause they were told to by two totaly different sources. its a 360 cubic inch 8.2 deck ford with tfs heads in a 2900lb car, clutchless 5 spd,, nitrous,, been 7.80's at 180something

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i will believe that there might be a minisque diff in some plugs
as in heat range tips lenghts , ets but to come make bold statements
that this plug will make more hp than the same equivalent plug from diffrent plug manufacture , is totally without merit ,
now if youre testing a totaly diffrent plug vs a racing style plug
with diffrent heat range , then i will believe some of youre statement!
other than that, show me dyno results with no other changes than
that of a plug change, using the same indexing , timing, etc
just a plug change thats all ,, lets see the results!!

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i belive he did show you with the diff types of engines he ran. now if you are calling him a liar because you didnt see it in person thats your problem. im positive that jeff dosent have anyhing to lie about.

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Thought this was April fools till i realised it's a few weeks away.

Plug INITIATES the burn , that's all it does , too cold a plug for the application 'may' leave a 'tad' power on the table due to unburnt fuel residing in base of plug , then you have too hot a plug 'may' leave a 'tad' power on the table due to mixure being lit off 'slightly' earlier , pretty 'negligible' which ever way you look at it.

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Can you show us PROOF?

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I have no argument with you or anyone else , the above statement ARE facts , WHICH PART DON'T YOU BELIEVE?'..........the way i see it is a guy changes plugs out & says it picked up , now were those autolites indexed exactly the same as the NGKs? , probably not as it would be impossible to do without indexing the first set , maybe he got lucky & the autolights just 'happened' to index themselves perfectly when installed (have we proof they were indexed the same?) , some guys claim the NGK picked up over the autolite ....................i'm willing to learn if you can tell me otherwise , legitimate question.

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Seriously. This is just a waste of time to get into stupid pissing contests over this stuff.

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you just figured out that goes on over here

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I found for a fact they idle better in my motor than the NGK so that works for me.

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I'm hearing a few say this.................most guys won't waste money changing plugs out unless the plug is past it's sell-by date or the engine is running intermitant , the logic here is the gap between ground strap & electrode has grown (worn) , this can cause slight misfires due to the increased voltage necessary to jump the gap , will also reduce the time period of spark , guys happy cos he fits a new set of plugs wherby the gap is correct & the misfire disappears , if these plugs happen to be a different brand the guy gets sold on em .....................just another angle on things , not bashing anyone.

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would 6hp improvement show on a time slip?

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... you might see a few thousandth but
you might think its anything(wind, temp).... but both
seen MPH

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mr obvious here first time listner first time caller
sorry dont have that dyno in my back pocket, ,
just have a 1320 errrrrr

This is the kind of crap that really gets on my nerves on here. When well known and respective people with real world experience give their input on a subject and somebody disagree's because he's changed 100's of plugs at the track and seen no difference. I'm sure Jeff and Brian don't have stock in autolite plugs so why would they lie and if you have changed 100's of plugs at the track and not seen any difference going from one style to the next or one heat rang to another maybe you should start your own post on how to read plugs.

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Ditto; was trying to stay out of this but he`s like that pesky fly that keeps flying around that you try to squash but can`t......been that way from his very first posts. Get a life homey.