after somehow a cam keeper c clip fell down into my flywheel, and i found some bad scoring on my sleeve, i finally got my 12.5 420 big bore kit and hot cams in.! First of all, now i see why everyone raves about the auto decomp! LOVE IT...just too easy now! The setup seemes to give me a bunch more lowend power, and even a bit more top end! I cant be happier!