ya, don't do too many engines at the dealerships ya know... quality and longevity have definately improved through the years. as far as the hp gain... i read something on here that stated it was something like 6hp??? not a lot but enough it would be nice to have those 6hp just from adjusting the valvs a certain way. i'm just coming up with conflicting information on the multiple cylinder method. going cylinder by cylinder is no big deal at all... i just want to make sure i have the correct information when adjusting multiple valves at once. you know what I mean?