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

what plugs for my 396 LT4?

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Old Sep 29, 2008 | 11:20 AM
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Default what plugs for my 396 LT4?
thanks
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Old Sep 29, 2008 | 11:34 AM
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What is the compression ratio? Depending the motor may like NGK TR55s or TR6s
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Old Sep 29, 2008 | 11:48 AM
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sorry i was lookin for my papers, i really dont even remember. its got flat tops , built for a 400 shot.

its pretty high

but i will NOT be spraying this year.
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Old Sep 29, 2008 | 12:02 PM
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hard to know with out specifics

I would say a 6 or 7 if high compression for NA.
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Old Sep 29, 2008 | 12:06 PM
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My ~11:1 stock bottom end setups like TR55s, but my 12.2:1 383 liked TR6s. Here's some good articles that will help you determine heat range and everything else too.

http://www.dragstuff.com/techarticle...ead-plugs.html

http://www.dragstuff.com/techarticle...ark-plugs.html
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Old Sep 29, 2008 | 01:25 PM
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Well considering you bought Brett's old motor you need a gasket style plug. I would start out with some AR3923's on that, maybe even a 3924.

Start cold and work you way up, dont start hot and work cold you will end up hurting things.

AFR heads require gasket plugs, just like LS1 motors.
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Old Sep 29, 2008 | 01:34 PM
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i was hopin you or he would chime in thanks
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Old Sep 29, 2008 | 04:28 PM
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Those autolites cross reference to like 4 other manufacture's plugs. NGK, Champion, etc.. so if you have a prefernece that you'd like to run with you can.
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