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

best spark plug?

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Old Jul 31, 2010 | 01:10 AM
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Default best spark plug?
whats the best plug you recommend for my lt1? and what gap to run?
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Old Jul 31, 2010 | 01:34 AM
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stock lt1 tr55 at .055"
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Old Jul 31, 2010 | 01:58 AM
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Dont you think it would depend on the motor combination...
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Old Jul 31, 2010 | 07:51 AM
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Stock gap is .050", not .055".

Plug choice depends on the motor. TR55s and TR55IX are very popular for stock and mild N/A motors.
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Old Jul 31, 2010 | 10:08 AM
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Whatever you do, dont buy bosch plugs. I have had nothing but problems with those.
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Old Jul 31, 2010 | 10:36 AM
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i run ac delco platiums run good
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Old Jul 31, 2010 | 10:39 AM
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NGK for everything, even for my lawnmaw ( spell hehe ).
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Old Jul 31, 2010 | 10:39 AM
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Originally Posted by RamAir95TA
Stock gap is .050", not .055".

Plug choice depends on the motor. TR55s and TR55IX are very popular for stock and mild N/A motors.
well im goin to be running them with that a1 cam kit, im just trying figure out everytihng i need
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Old Jul 31, 2010 | 01:01 PM
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Originally Posted by ryanosborne
well im goin to be running them with that a1 cam kit, im just trying figure out everytihng i need
Go with the NGK TR55s gapped at .050".
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Old Jul 31, 2010 | 01:07 PM
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It depends on what you're plugs coming out look like. You may need to go to a hotter or colder plug, but I would start with putting OE AC Delco's in, then pull them after 30 days and see what they look like and adjust if necessary.
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Old Jul 31, 2010 | 01:19 PM
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Originally Posted by JimKellyfan
It depends on what you're plugs coming out look like. You may need to go to a hotter or colder plug, but I would start with putting OE AC Delco's in, then pull them after 30 days and see what they look like and adjust if necessary.
How would you know based on high mileage plugs to go to a hotter or colder plug on a completely new, rebuilt motor with different characteristics that OEM?
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Old Jul 31, 2010 | 01:21 PM
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My current setup = NGK TR6IX gapped at 0.037" - but I'm boosted.

When N/A, I was running TR55IX gapped at 0.052"
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Old Jul 31, 2010 | 01:36 PM
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Originally Posted by RamAir95TA
How would you know based on high mileage plugs to go to a hotter or colder plug on a completely new, rebuilt motor with different characteristics that OEM?
Go with stock to start.
Then, run them for awhile.
Then, depending what they look like coming out will tell you what direction is needed to go in, if any.
( running lean, carbon foul - tan, white, black, yada, yada etc. )
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Old Jul 31, 2010 | 01:39 PM
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Ok, a1 cam kit.
Is that a longer or shorter duration than oe ?
I hadn't seen that post.
What other mods from oe are in place ?
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