I love roller rockers! A set of 1.5's gives a power increase the best way, through a reduction of friction... 1.6's are up to the person though... 1.6's will increase your peak hp RPM, so you will gain power, but it will be higher up in the power band... this means you will lose a bit on the bottom (this is where things get shady, since you are swapping to full rollers, the bottom end tends to remain unchanged, or get slightly higher, the top end has bigger increases... the only real way to test is with a set of full roller 1.5's Vs. full roller 1.6's, what should happen is the set of 1.5's will have more power on the bottom, 1.6's more on top)
-My favorite setup for LT1's is 1.6 on the intake, 1.5 on the exhaust.... first of all, some LT1's require new valve springs to go to 1.6 rockers... The only problem with the springs is on the exhaust side, so the mixed set eliminates the need for new springs. (nothing is worse than doing a job twice, because a spring is binding, AND finding a set of springs when the car is apart)
-The mixed set seems to be a happy medium for the LT1. You get better gas mileage, cooler engine from reduced friction, and more power spread fairly evenly accross the powerband.
PS there is a company that sells the mixed set already, I just can't rember, or find which one it is
