Yes I've read that. My point is, The PI heads on the Gen2 Lightning are very unforgiving. 4 valve heads are very forgiving. the timing on 4 valve heads can be pushed past the point of making power and one can expect little detonation. On the PI 2 valve head detonation is a killer just past 20 degrees timing with C16 and 25 psi boost. I have yet to see any info on the PI heads and E85.