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post #1 of 4 Old 03-18-2016, 07:40 PM Thread Starter
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what spark plugs

I was wondering what spark plugs to run on a 306 with 11r 190 twisted wedge heads with a 70mm turbo

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post #2 of 4 Old 03-23-2016, 12:59 PM
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I had a similiar combo, I always ran NGK 4554 (8 heat range) and loved them. I also tried the 5238's (9 heat range), but didn't feel I needed one colder than the 4554. Very affordable and durable plugs.

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post #3 of 4 Old 03-23-2016, 01:00 PM
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Going to a 393 windsor with an 80mm ITS, I am planning on using the 5238's.
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post #4 of 4 Old 03-23-2016, 01:03 PM
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I'd start with 1 heat range colder than what TFS recommends for the 11Rs. You should be able to decode the heat ranges with Google.


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