LT1-LT4 Modifications 1993-97 Gen II Small Block V8

TR55 Heat Range ?

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Old May 11, 2018 | 01:07 PM
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Default TR55 Heat Range ?

383 H/C motor
plugs have about 2-3k mi on them

Comments on heat range?

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Old May 11, 2018 | 04:25 PM
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Cant hurt to try a tr6. Im using tr6's in my cammed lt1 and it runs identical to the tr55's i had in.
i get a little nervous with 36 degrees of timing at 6200rpm so i threw in the tr6's.
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Old May 11, 2018 | 05:02 PM
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My take on the plug color is it is not to "hot" but I was looking for comments if that is what anyone else thinks by looking at the plug pic

Car runs fine, no detonation.

I have read if one has a larger CI motor than the 350 and higher compression than stock, one heat range colder than stock is recommended

I was just concerned, based on the color of the plug ground strap, that going to a 6 would be to cold of a plug

On a side note I was curious if running a cooler plug could drop HC level or have any affect on it.
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Old May 11, 2018 | 05:05 PM
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Originally Posted by 350 groundpounder
. Im using tr6's in my cammed lt1
what gap .035?
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Old May 12, 2018 | 11:16 AM
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From: Jackstandican
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I run TR6's with a .035 gap on a 11.0 CR. Those plugs look fine to me, IMO.
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