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Discussion Starter · #1 ·
I have a 14-1 sbc with 325 hp big shot plate currently running a 5671 A-9 plug with vp c-16 fuel

What plugs and fuel are you guys running????

I have a 23 degree head motor
 

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SOFA KING WHAT?
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R5671A-10 and 11 for that hit. C-16 Fuel
 

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I have a 14-1 sbc with 325 hp big shot plate currently running a 5671 A-9 plug with vp c-16 fuel

What plugs and fuel are you guys running????

I have a 23 degree head motor
I'm running the same fuel and plugs as you. My motor has a touch less compression than yours.
 

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Discussion Starter · #5 ·
i have a friend with a similar combo to me and he runs the -8 plug

same compression and fuel
what gives i want to try the -8 or will it hurt me
what are the advantages of the colder or hotter plug
thx
 

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EFI/N2O JUNKIE
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I have 14.8:1 with a 125/150hp shot and use the R5671A-10's. Pulling 8 degrees the plugs are perfect. I would need -11's to run more timing though.
 
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