LT1-LT4 Modifications 1993-97 Gen II Small Block V8
View Poll Results: Which plugs work best for the LT1?
TR6
4
5.56%
NGK TR55
41
56.94%
Factory AC Delco platinums
13
18.06%
Autolites
9
12.50%
Bosch Platinum +4
4
5.56%
Other..
1
1.39%
Voters: 72. You may not vote on this poll

Which plugs are best for the LT1

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Old 02-01-2008, 09:56 AM
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Default Which plugs are best for the LT1

What plugs do you guys recommend for the lt1? Keep in mind my engine will be mostly stock. Just with ram air, headers, tune, and ported heads.
Old 02-01-2008, 10:01 AM
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NGK TR-55's
Old 02-01-2008, 10:01 AM
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factory ac delco double platinums. trust me worth the money.
Old 02-01-2008, 02:45 PM
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+1 for factory a/c delco
Old 02-01-2008, 03:44 PM
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Denso iridium.
Old 02-01-2008, 03:45 PM
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Originally Posted by 1badzee
NGK TR-55's
I bought pair of NGK and month later it fouled one out

so i went with AC-DELCO 5 months later still going!
Old 02-01-2008, 03:50 PM
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NGK TR55 all day long
Old 02-01-2008, 04:59 PM
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are those e3's any good or does anyone use them?
Old 02-01-2008, 05:04 PM
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NGK TR55 are almost always recommended for n/a motors.
Old 02-01-2008, 05:09 PM
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ngk's here
Old 02-01-2008, 05:24 PM
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NGK tr55's
Old 02-01-2008, 05:35 PM
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NGK tr55's, no problems here
Old 02-01-2008, 06:09 PM
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I've had bad luck with ngk's. Now I run autolites with no issues.
Old 02-01-2008, 06:15 PM
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NGK TR55. no probs here
Old 02-01-2008, 06:40 PM
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NGKs with no problems.
Old 02-01-2008, 06:55 PM
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Ive had good luck with NGK's on N/A cars and autolites on boosted or sprayed cars.
Old 02-01-2008, 07:19 PM
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autolite copper core.
Old 02-01-2008, 08:07 PM
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Those recommending the Autolite, why don't you list a part number?

I never ran the aluminum heads on a stock motor but I am guessing 106 or in some cases maybe 104. I know the 106 is a touch hot for the iron head motors but I think it may be good for a stock aluminum head motor.
Old 02-01-2008, 08:14 PM
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been using ngk's in lt1 and ls1 motors since always
various heat ranges, ngk tr55 are like 1.80$ where i get them
best plug for bolt ons lt1 or ls1
Old 02-01-2008, 08:49 PM
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Originally Posted by 96capricemgr
Those recommending the Autolite, why don't you list a part number?

I never ran the aluminum heads on a stock motor but I am guessing 106 or in some cases maybe 104. I know the 106 is a touch hot for the iron head motors but I think it may be good for a stock aluminum head motor.
106's when I was running .039" felpro gaskets with stock chambers, and 104's with my new setup.


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