Well as i rebuild the midnighter i found an issue. One of the HLA lifters failed big time!! But with a cam in the 550-600 lift range i am not surprised. Here is what happened. The top broke off and this is sort of common on a HP 2.3. I have no idea why this happens to date. As the plunger does not ride that high??? Very frustrating. Also this is a standard body lifter!!
(http://i740.photobucket.com/albums/xx46/proguns/001-123.jpg)
As you can see the body was modified by me so a performance cam could be used by shimming the lifter. I started doing this before the lifters were even available. Below is the MOD!!
(http://i740.photobucket.com/albums/xx46/proguns/003-52.jpg)
valve float? lifter having issues following the cam profile? dono either.
The Midnighter has hefty springs. But that could be an issue!!