Quote Originally Posted by DBRODS View Post
Here in the last few weeks I've started picking up a ton of midrange knock. Thinking its the fuel around here, that they changed to the winter mix already. Plus with the compression my motor is at it wasn't happy. So I tuned it down a little to keep it safe. I need the block and heads for the stroker build and didn't want to accidently hurt anything.
Maybe you should run a little race fuel just to make sure it is the winter blend.