Here's all the details on the combination I just bought:
GM High Tech Performance LS1 Build
They test the TSP MS4 cam that I just bought. Just a change of cam and valve springs and push rods produced 482HP on the engine dyno. Adding a set of CNC ported LS6 heads jumped that figure to 529HP. Bolting on a F.A.S.T manifold and larger Throttle body bumped the figure up to 544HP.
Some other tests I've seen show the 4BBL manifold producing even more power than the F.A.S.T manifold.
Pretty impressive from a stock cube, stock bottom end 346 cube LS1 motor.
Cheers