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Which plug in head and cam engine?

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Which plug in head and cam engine?
Old December 24th, 2012, 08:02 PM   #1
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Which plug in head and cam engine?

What the best plug that I should run? My engine is a 10:5.1 comp with Greg good heads and cam. From what I've read I've come down to 2 plugs
Ngk
ZFR5F11 stock heat range.
ZFR6F-11 which is a step colder

Both have the needed extended tips on them


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Old December 24th, 2012, 09:08 PM   #2
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Just get the ZFR6F, don't get the -11. I believe the -11 means the plug is pre-gapped to .044. You will want to gap your plugs at .030-.032.
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Old December 24th, 2012, 09:53 PM   #3
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What is wrong with the RC12ECC
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Old December 24th, 2012, 11:16 PM   #4
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Originally Posted by 99RT10&GTS View Post
Just get the ZFR6F, don't get the -11. I believe the -11 means the plug is pre-gapped to .044. You will want to gap your plugs at .030-.032.
Will do. Do you think the step colder will make me lose power at all or it will be so small I shouldn't worry about it


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Old December 25th, 2012, 05:57 AM   #5
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I dont think its about losing power with plugs as much as how well it will run. or foul them
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Old December 25th, 2012, 06:44 AM   #6
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Originally Posted by plumcrazy View Post
I dont think its about losing power with plugs as much as how well it will run. or foul them
Correct. And Jack B is correct, you could use the stock heat range and be just fine. The RC12ECC is a great plug!
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Old December 25th, 2012, 08:12 AM   #7
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Im running tr6-ix (stock # 3689) in mine with the blower. IX is for iridium.
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Old December 25th, 2012, 10:54 AM   #8
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I use the stock plug RC12ECC gapped at .030 per Greg.
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Old December 25th, 2012, 02:20 PM   #9
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I use the stock plug RC12ECC gapped at .030 per Greg.
That is a Hard pIug to improve upon for a NA car.
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Old December 26th, 2012, 02:19 PM   #10
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That is a Hard pIug to improve upon for a NA car.
Cheap too. I've had no issues with these plugs on my setup. Greg seems to know what he's talking about.
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