sparkplugs for 440

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RoelB
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sparkplugs for 440

Post by RoelB »

What would be a good plug to use on my RoadRunner
Stock motor with orginal Holley.
Thanks!!
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AllKiller
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Post by AllKiller »

I swear by the NGK BPR6S Or the Iridium XR5

But no doubt there will be some Champion fans RJ12YC
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Les Szabo

Post by Les Szabo »

yep NGK all the way :thumbright:
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RoelB
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Post by RoelB »

fine by me, thanks!!
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Steve
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Post by Steve »

What makes one plug better than another plug gents??? I appreciate some run hotter than others etc but how do you know what is a good plug for your car? I use Autolite copper core 85s in my completely stock 383 4bbl but only because thats what I get when I ask for a set at the place where I get my service parts.....I dont have any probs with them but should I put more thought into it???? :read2: :read2:

Cheers, Steve
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Pete
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Post by Pete »

Quiffy's right on the money there!!! ;)
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Guy
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Post by Guy »

Pete wrote:Quiffy's right on the money there!!! ;)
Yep XR5's here :thumbright:
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GTXJim
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Post by GTXJim »

So what would be the best NGK for an indy headed motor with 10.75:1 compression??
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Pete
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Post by Pete »

I ran the NGK's in a 12.2:1 compresion motor with no issue.
Can't remember if I changed the heat range over the 6s though............
Pete Wiseman; Cambridge.

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Bryan S
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Post by Bryan S »

GTXJim wrote:So what would be the best NGK for an indy headed motor with 10.75:1 compression??
NGK 6s
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AllKiller
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Post by AllKiller »

GTXJim wrote:So what would be the best NGK for an indy headed motor with 10.75:1 compression??
Jim
NGK R 5670-8 = 2nd coldest and probably will work the best with that compression, although the others will work well

NGK BP7 ES

NGK 7173.

Iron heads need a hotter range plug than an aluminum

Last number on NGKs is the heat range lower the number the hotter the range

Champions are other way round higher number is higher heat range

But that means how quickly they dissipate heat not how hot they run
:thumbright:

NGK 7 street
8+ racing

NGK even do projected and Non projected tip for use with large amounts of Drugs :thumbright:
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AllKiller
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Post by AllKiller »

Steve wrote:What makes one plug better than another plug gents??? I appreciate some run hotter than others etc but how do you know what is a good plug for your car? I use Autolite copper core 85s in my completely stock 383 4bbl but only because thats what I get when I ask for a set at the place where I get my service parts.....I dont have any probs with them but should I put more thought into it???? :read2: :read2:

Cheers, Steve
Autolite is a good plug...if its working with no probs stick with em
I just prefer NGKs....you wot really notice any seat of the pants difference Steve
But you might from Champs to NGKs, i did
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TyreFryer
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Post by TyreFryer »

Good reference info Steve, I'll make this a sticky.
Martin Walker
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AllKiller
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Post by AllKiller »

:thumbright:
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John
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Post by John »

I`ve just found out I have champs

Time for a change I guess :?
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