what fuel

[NA10.5]

i have a n/a 555 bbc,15.1 shifting about 75-7700 rpm in 3300lb car.what do you trhink c16 or c14+? thanks

[Maximum Race Engines]

For N/A applications, I would run the c14 or c14+. The c16 is for nitrous assisted engines, and is made for that reason. We have seen power differences between the two running on motor alone, with the c14 making more.VP says that c14 is good for up to 16.1, but the c14+ has just a little more octane in it, and I would run that from 15.1-16.1. The c19 is real nice, but real expensive as well, and is good for 16.5+.

[Pooch565]

I agree with the C14+. Also, we have a ton of racers with a combo like yours running C15. The 540 to 598's seem to really like this fuel. You can't go wrong with either fuel.

Thanks,
Jason