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Can someone please give me the correct ngk plug #/ part# for a 418, sbf, vic jr, 10.5 to 1, approx 175 shot, running 110 octane leaded fuel...thankyou for the help!
 

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.......
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5671-9 that plug should work
 

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Not teyin to high jack but maybe learn..

I have what id call a similar combo.
427 10 to 1
Spraying 225 on C16
and I'm using 5671A-7's as per the previous owner

Is that way off? What would be reasoning for that?
 

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that guy....
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2,099 Posts
Not teyin to high jack but maybe learn..

I have what id call a similar combo.
427 10 to 1
Spraying 225 on C16
and I'm using 5671A-7's as per the previous owner

Is that way off? What would be reasoning for that?
Id say YES. Start off at -9s
 
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