I missed this thread, I've been talking with the guys at Delta Camshaft about a performance grind for the 617 and they need two things: A stock cam, and the clearance between the valves and piston. These guys do great work, I've used both a torque grind in a Subaru EA81, and what I could best describe as a mid-range grind in the 300-6 in my van, both with spectacular results. They can also play with the timing as well to move the powerband.