well as many of you know i am running a turbo 421. i was riding ita nd it ran fine built 10lbs of boost no problem i came back idle to launch again and it drapped a cylinder and would boost over 6lbs and it was fluttering inbetween 3 and 6lbs. i pulled it in to the garage and check comp both cyls are at 115lbs has spark carbs are clean but my coolant is kinda oily. im am lean twards a bad oring but im not building preassure in my radiator.