On zzp it says the xp is the largest cam that can be ran on stock heads but they also suggest in the notes to get machined guides and tells stories about bad oil leaks. I plan on getting new lifters, rods, springs and retainers with it. but with the package im getting, it comes with modded retainers(not sure if that makes much of a difference). so my question is for you all who've had experience with the cam... do i need to machine down my guides to reliably run this cam without destroying the retainers?
Any advice is greatly appreciated. Thanks
