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What spark PLugs to use on a 402cid

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Old 06-07-2008, 10:39 AM
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Question What spark PLugs to use on a 402cid

Are NGK TR 55's good spark plugs to use on a 402 ? what gap should they be set at ? what you reccomend?
Old 06-08-2008, 03:58 PM
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no one ? ANyone ? what should the NGK TR55 Spark Plug gapping be ?
Old 06-08-2008, 06:31 PM
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im useing tr6's
Old 06-09-2008, 10:12 AM
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Need to know Compression,all motor,nitrous or blown?
Old 06-09-2008, 01:57 PM
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I'd use a colder plug equiv to a heat range 6 on a 402 just to be on the safe side.

Check out these guys. Their plugs worked great in my car.

Last edited by Navy David SS; 07-23-2008 at 08:16 PM. Reason: removed link
Old 06-14-2008, 03:41 PM
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If you are running a high compression set up (11 to 1 or higher) go with the TR 6 if you are running a stock type compression ratio use the TR 55 ...
Old 07-23-2008, 07:17 PM
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i've been using autolite 103 in my 408. i'm switching to AR-94.
Old 07-23-2008, 07:18 PM
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TR6's
Old 07-23-2008, 07:28 PM
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I'm using TR6's in my 402. They seem just fine to me...

Last edited by 1999vetteroo; 07-29-2009 at 10:18 AM.
Old 08-07-2008, 10:31 AM
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i actually just put a set of autolites in since autozone didnt have the tr6's and it made a nice improvement over the fouled tr6's



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