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Discussion Starter · #1 ·
Ive done some research and have seem that people suggest using the NGK (6509) LTR6IX-11 iridium spark plugs in 6.4L 392 Hemi's. I have a 2015 SRT 392 and want to make sure it is compatible before i buy them.
 

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You want NGK 97408, rockauto has them far cheaper than anywhere else I saw. What's funny is if you buy the same NGK spark plug that comes in a box with "Mopar" on it the price doubles.
 

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Discussion Starter · #3 ·
You want NGK 97408, rockauto has them far cheaper than anywhere else I saw. What's funny is if you buy the same NGK spark plug that comes in a box with "Mopar" on it the price doubles.
i looked at those as well but ended up going with the iridium ones. heard that the iridium is better for modded 6.4s
 

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i looked at those as well but ended up going with the iridium ones. heard that the iridium is better for modded 6.4s
Doesn't make much of a difference unless your making 8+psi or 100+shot, then you would want a step or two colder
 
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