How would these two compare to one another? I'd be running a MS4 cam with an LS6 intake for now but will be going to a FAST later on.
Thanks

 

definitely go with the PRC 215. look up a member named Honda Nick. he is one of the first running those new PRC 215 and actually had the MS4 also with those heads.

 

The Stage 1 LS6 head is a great head on a budget, while the PRC 215 is the top of the line in terms of aftermarket casting quality & technology. It is built off a completely new casting with different port designs, valve angles & thicker deck surfaces. The 215s also have a completely cnc cut combustion chamber. The PRC 215s will allow you much higher compression, horsepower & torque while still being bolt on friendly even with stock rocker arms!