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I have always ran C14+ in my naturally aspirated 15:1 sb2.2 small block with really great results. This motor sees 9,000 rpms every pass. I am nearly out of C14plus and the track I am running this week does not sell it, but sells C14 and C16. What is the next best option for me to run and how much et will be lost by running C14 instead of the C14plus. I am bracket racing so consistency is an issue.
 

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I run C15 which is a 50/50 mix of C14 & C16.

15.5 to 1 compression 582 bbc at 8200 rpm, fuel recommended by Tracy at Sunset.
 

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Discussion Starter #3
I run C15 which is a 50/50 mix of C14 & C16.

15.5 to 1 compression 582 bbc at 8200 rpm, fuel recommended by Tracy at Sunset.
I will put a call into the track tomorrow to see if they sell C15. In fact, does anyone know if Atco sells C15?
 

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I will put a call into the track tomorrow to see if they sell C15. In fact, does anyone know if Atco sells C15?
They should be able to mix it for you, I know Cecil offered when I was close to needing some at the track. C15 is not very common in this area.
 
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