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Plug gap is dependant on cylinder pressure/voltage , those cut-back plugs are/were 'marketed' for high HP motors running high cylinder pressures , hence the tighter gap.............some guys on here running NGKs will be pulling em out & cutting the straps back , will also go through two sets of cut-backs to one set of standard type plugs...........maybe the cut-backs worked better in you're application due to problems elsewhere , might not gain in every application , the NGK 'V' series plug definatly did'nt help regards my combo.

With respect.

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I never seen the V or 4 point grounds do anything for
power but did get a lot longer life out of them...
I had a set given to me for my street rod(I would
have never bought a set)... same principle ... electricity
goes to the easiest ground path

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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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i think you can make out anything you want, and put what ever numbers that are in line with that, to be the truth.
still when you talk of ngk race vs ar race plug and all you do is change the plug , you cannot , will not gain 10 hp peroid !!
the only way it could add any hp is if that cyl (s) wasnt fireing , or plug(s)fouled!!
if this was any kind of a true senario, ngk, motorcraft, denso, bosch,
ac delco, pulsar, and any other plug co, would be out of buisness tommorrow over such a find , it would be historic perportion in the racing world
OOOO MY GOD ,, my prayes have been answered ,!! all i need to do is buy set of $ 15.00 plugs
please keep this going i can see people throwing out there plugs now

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so if you had a back to back test, between v and std, say it,, just dont say im wrong,,, tell what you found..

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I did say it , no power gain using NGK BCRES over the 'V' series NGK , just talking out loud which had nothing to do with autolites.

I personally don't use the autolite plug due to it being harder to read (nitrous) , i prefer the NGK being the fuse as opposed the piston with the autolites.............maybe you got lucky the way the autilite was indexed as opposed to NGK.

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What plug number would it take for
a steel headed bb mopar, with a 3/8" reach, and a
13/16 wrench size, I have ran NGK'S for several seasons,
and would like to do some testing with the autolites,
and see if there is anything there?????????????

Thanks
Dave

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but moved on to bigger things,, like working on controling the valvetrain,, or ring seal

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Maybe you changed plugs after working on this.

Only messing around , could'nt resist.

BTW , how do you know indexing did't help?

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one question I have is a lot of people are recommending heat ranges based on compresion ratio alone but isnt cam selection a huge factor being cylinder presure is determined largely by cam duration and compresion ratio. just a thought

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Plug heat range for a particular engine is just a guess on the tuners part , & you're correct regards cylinder pressure , what plug works in one motor running 11:1 won't necesarily be correct for another motor running similar CR , this is why reading plugs will be the deciding factor.

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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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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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i think you can make out anything you want, and put what ever numbers that are in line with that, to be the truth.
still when you talk of ngk race vs ar race plug and all you do is change the plug , you cannot , will not gain 10 hp peroid !!
the only way it could add any hp is if that cyl (s) wasnt fireing , or plug(s)fouled!!
if this was any kind of a true senario, ngk, motorcraft, denso, bosch,
ac delco, pulsar, and any other plug co, would be out of buisness tommorrow over such a find , it would be historic perportion in the racing world
OOOO MY GOD ,, my prayes have been answered ,!! all i need to do is buy set of $ 15.00 plugs
please keep this going i can see people throwing out there plugs now

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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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i think you can make out anything you want, and put what ever numbers that are in line with that, to be the truth.
still when you talk of ngk race vs ar race plug and all you do is change the plug , you cannot , will not gain 10 hp peroid !!
the only way it could add any hp is if that cyl (s) wasnt fireing , or plug(s)fouled!!
if this was any kind of a true senario, ngk, motorcraft, denso, bosch,
ac delco, pulsar, and any other plug co, would be out of buisness tommorrow over such a find , it would be historic perportion in the racing world
OOOO MY GOD ,, my prayes have been answered ,!! all i need to do is buy set of $ 15.00 plugs
please keep this going i can see people throwing out there plugs now

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Really...over 7-10HP? So the fact that I just gained 17avg HP on an engine I freshened for a friend of mine should rock the racing comminity?

Unless you have proof otherwise, don't knock the SHARED information too hard. If you've never tried it, don't knock it!!
Brian Hafliger
IMM Engines

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Maybe it's time for some of us to keep our secrets secret Your results may vary I remember the same comments on switching from a stock street Hemi dual point distributor to a converted Hayes S4 ignition in the same distributor from one race to the next, the car pickup almost two tenths and right at 3 MPH with that change only Several well known "stock" class racers said no way, but they did have the Hayes ignition on thier cars at the next race

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Wow, great read guys

Could I bother you to make suggestions on my engine too?

440 .40 over, stealth heads, 9.5:1 compression..
thanks

Mike

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yep just buy some autolite plugs that will do it
lmao

ooo and please ,, if you do have any more secrets like autolite plugs , keep that one , to youre self, that way noone will know why youre car picked up that 2-3 mph and that 1-2 tenths,
and you can charge a guy a bunch of money when you work on his car and make it go faster .
wonder if it makes a diffrence if i was to use motorcraft plugs??
but they said only autolites mmm

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Wow, great read guys

Could I bother you to make suggestions on my engine too?

440 .40 over, stealth heads, 9.5:1 compression..
thanks

Mike

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yep just buy some autolite plugs that will do it
lmao

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Oh... I see you presented your data