Yeah an 06 mastiff 117? That is an evo bottom end, with twin cam style heads. You will have the standard s&s hydraulic tappets. I've got mine apart in my basement same motor
Standard S&S Hydraulic Tappets in your engine Bro...Evo style with TC and Your heads as far as in compatability
ooops...others replied before me in the same manner with Accuracy & Correct answers.
Gotta Love this place
Vince