I can’t imagine that 2.02s would decrease the low end with a blower. But, your going to have a phenomenally more efficient intake for boost with the heads. And your still going to have efficient chambers, too. So you’ll probably find out that you’ll see a drop in PSI of boost because part of your current boost is overcoming the smaller intake port. It will probably change the tune requirement up some. Boost that was used to overcome the smaller intake ports and valves is going to equate to more cylinder charge, especially at low RPM where there is increased charge time for the cylinder to fill. The more efficient the heads, the better the blower will work due to the increase of adiabatic efficiency (less heat in the intake charge generated by boost). Just curious, what kind of static compression, how much boost, and what fuel do you run this on? Are you running locked out timing with a boost retard? Going by the current trends in forced induction with good cylinder heads, the cam with extra exhaust duration, equal overlap, and 112 LSA would be good with the speedmaster heads. There’s going to be more charge in via boost, which makes more volume of exhaust gas for the pistons to push out.
