Thanks for the link Hank, looks like another route that'll let me run more boost w/o worrying about detonation \:\)

EFI-DIY,

You said '06 and up 4200's are better and '08-'09 4200's are boost friendly, so I'm trying to track down a motor ('08 or '09) but can't find any info on the motors and the differences between them or any upgrades made to the motors. Do you have a link or anything that houses this kind of info on the vortecs?

"If you're gunna do something, do it to the best of your ability...or else what's the point?"