HI guys

I just dynoed a new motor and was hoping one of you experts could look at the dyno sheet and may be try to guess what the problem is
4.15 stroke 4.380 bore trickflow 240 heads six pack with all the promax stuff
hughes STL4246BS3-9 242 intake 246 exh 109 lsa 105 centerline 600 lift
The motor ran very nice smooth idle and ran it up to 5700 smooth as silk but the dyno sheet looks crazy

!cid_Resized_6404493931002.jpg