I was hoping for around 550 hp but could only muster 493 .
Torque was good running 428 ft-lbs by 3800 and 482@ 4700 !
Power dropped off abruptly at 6200 which surprised me for W2 heads. View attachment 1715816539
IMO…. The lack of power you were looking for has been mentioned with the wrong intake, but a dual plane for a W2 isn’t an easy thing to find and the MP unit… is questionable for this application. Considering it is a aluminum copy of the older stock units.
I also think the cam duration is a bit small for a single plane. Also as you said it is a compromise cam. The few hundred missing rpm up top like J Robb was saying. I also wonder about what MP Official thoughts on head flow. Valve springs came to my mind as well.
All in all, I don’t see this as a bad deal. I think it did what it was supposed to do.
Quick question… you might have previously stated the answer to… Are the dyno headers the same diameter as the car headers?