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spark plugs for H/C car?

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Old Nov 12, 2007 | 02:55 PM
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Default spark plugs for H/C car?

ls1 H/C and all bolt-on, about 400rwhp. What spark plugs should I go with.? THANKS FOR ANY INFO.
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Old Nov 12, 2007 | 03:02 PM
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I run Autolite193 plugs without any problems. My set-up is in my sig. Compression is about 11.0:1 running on regular pump gas.
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Old Nov 12, 2007 | 03:04 PM
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Ngk Tr55
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Old Nov 12, 2007 | 03:06 PM
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NGK TR55's are what I ran.
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Old Nov 12, 2007 | 03:17 PM
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ngk, how much should i gap them or stock gap.
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Old Nov 12, 2007 | 03:22 PM
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Originally Posted by nealws6
ngk, how much should i gap them or stock gap.
I think I had mine gapped at either .45 or .55
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Old Nov 12, 2007 | 05:35 PM
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thanks guys getting the ngk tr55, just wasn't sure about them.
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Old Nov 12, 2007 | 10:24 PM
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Autolites are made by ford i wouldn't put them in my car

NGKs gapped to stock gap .060
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Old Nov 13, 2007 | 07:57 AM
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NGKTR55s. I actually prefer Iridium, I ran them for 75k in my ls1 on sams and walmart gasoline and they were clean as can be, still gapped right.
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Old Nov 13, 2007 | 08:09 AM
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On my LT1 car I ran TR-6 when going over 400 rwhp but with LS1's it seems like they are a lil more efficent, I plan on putting in a new set of TR-55's
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Old Nov 13, 2007 | 08:16 AM
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Originally Posted by Black99CamaroSS
Autolites are made by ford i wouldn't put them in my car

NGKs gapped to stock gap .060
Tell that to Ed Wright. He only runs Autolite plugs & hates NGK. He has had too many NGK plug failures & suggest against using them. And I tend to believe him since he has been in the game since before I could walk.
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Old Nov 13, 2007 | 11:09 AM
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ngk tr 55 take them out of the box and put them in
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Old Nov 13, 2007 | 01:13 PM
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gap em to .45 or .50........
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Old Nov 13, 2007 | 02:10 PM
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I run TR6s in my H/C car
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Old Nov 13, 2007 | 02:14 PM
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i just had some NGK TR55IX's they are called I believe put in... not sure what the difference is... when I get the car back in a couple months i'll let you guys know how i like em....
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Old Nov 13, 2007 | 02:46 PM
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Ngk Tr55's here too.
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Old Nov 13, 2007 | 02:54 PM
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Autolites are made by ford i wouldn't put them in my car
Autolites are made in the USA by Honeywell not Ford. NGK's are made in Japan by those two guys on the Wii commercial. Ive been using Autolite and Autolite race plugs for 27 years now with no failures attributed to the plugs. The only down side Ive seen with the Autolite plugs is selection and local stores don't seem to carry the race plugs
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Old Nov 13, 2007 | 03:30 PM
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Originally Posted by Z28/2002
I run TR6s in my H/C car
I run TR55 (.040) in my H/C/I C5
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Old Nov 13, 2007 | 03:40 PM
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I run TR6's in my H/C car also. 11.5:1 compression ratio gapped at .035 running on 93 octane.
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Old Nov 13, 2007 | 03:44 PM
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tr 55 gapped at 39 for me
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