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Old 01-27-2008, 08:34 PM   #1
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Default What spark plugs to use in 402 LS2 stroker

Are the plugs the same depth as the LS1 plugs? And what would be a good plug for my 402 LS2 engine? Please see details in my sig. The CR should be about 11.0:1...
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Old 01-27-2008, 11:28 PM   #2
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i was told tr6's for my 408 and my c/r is more then that
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Old 01-28-2008, 12:44 PM   #3
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i'm running TR6's, my compression is around 11.8,
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Old 01-28-2008, 01:24 PM   #4
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We have had good experience with the NGK's. Not for sure if a colder plug is needed in your setup.
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Old 01-29-2008, 05:47 PM   #5
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i ran the tr6 in my ls1 with the juice. no problem. transam98 and 89formulaws6 are you guys running pump gas with more that 11:1 compression?? just curious i am soon to order the heads for my 402 and was thinking of going 11:0 or 11:5 to 1
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Old 01-29-2008, 06:58 PM   #6
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TR6 if you run stocker style cylinder heads. If you run ET or another that new cast check with the manufacturer because they use a different plug.
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Old 01-29-2008, 08:30 PM   #7
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Quote:
Originally Posted by rpmauto View Post
i ran the tr6 in my ls1 with the juice. no problem. transam98 and 89formulaws6 are you guys running pump gas with more that 11:1 compression?? just curious i am soon to order the heads for my 402 and was thinking of going 11:0 or 11:5 to 1
11.0 is fine for pump gas. My engine is not that high but several friends are 11.0 or higher and have 0 issues with that compression and pump gas.
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Old 01-29-2008, 11:21 PM   #8
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Question how to figure out the compression ratio ?

how do you calculate the compression ratio for an engine with heads ?
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Old 01-30-2008, 12:12 AM   #9
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Quote:
Originally Posted by rpmauto View Post
i ran the tr6 in my ls1 with the juice. no problem. transam98 and 89formulaws6 are you guys running pump gas with more that 11:1 compression?? just curious i am soon to order the heads for my 402 and was thinking of going 11:0 or 11:5 to 1
I'm running 11.8 CR on shitty California 91 octane. with the right cam and the right tune it's not a problem
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Old 01-30-2008, 05:26 PM   #10
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in my 408 im running tr6's there the best
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Old 01-30-2008, 08:17 PM   #11
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TR-6 gapped to .045 -.050
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Old 02-02-2008, 09:42 AM   #12
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Tr 55,tr-6 .045-.055 depending on comp ratio's and coldness requirements
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Old 02-02-2008, 09:42 AM
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111, 402, 408, carbureted, compression, high, ls, ls1, ls2, lsx, plug, plugs, ratio, spark, stroker


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