Prefered Spark Plugs?

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08-13-2004, 10:52 AM

#21

joe900sc

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Re: Prefered Spark Plugs?

What's the difference between a 5671 series NGK and a 5673 series???

I currently run 5671-8 in my Eickerts...Just Curious...

08-13-2004, 10:56 AM

#22

cuda

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Re: Prefered Spark Plugs?

Quote:

Originally Posted by 97BossHammer

AC Delco MR43T's in N/A 454 Mag.

Same here 454/420

08-13-2004, 11:15 AM

#23

BenPerfected

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Re: Prefered Spark Plugs?

I recommend what ever is on sale that has the correct reach and heat range.

08-13-2004, 11:17 AM

#24

Cord

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Re: Prefered Spark Plugs?

I'm using mr43's in a n/a 540. I'd switch to a bosch platinum if I could cross reference the number.

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08-13-2004, 11:44 AM

#25

robyw1

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Re: Prefered Spark Plugs?

I have found that AC plugs hold up better in a blown application than ANY OTHER BRAND. The Platinum plugs fail under the first hint of detonation and I believe they are the first cause of detonation in a blown motor. Now in the marine industry we only play with 5-psi to 8-psi of boost but the AC plugs (not rapid-fire) hold up very well in applications with 19-psi to 22-psi of boost. been there done that don't want to do it again.