Save your money for something else. Have you ever seen a proper wear pattern on a valve tip when engine builders check for pushrod length? It is RARELY more than .060" wide. Friction at the valve tip on a rocker arm is minimal. The rocker is barely moving across the valve tip. The friction is at the trunion where the rocker does all of its movement. Also a majority of hp gain from roller rockers is preventing rocker deflection due to higher than stock valve spring pressures. Magazine tests don't show the whole picture for any test because they show 1 engine. We played with Circle track motors on the dyno of varying hp and saw different gains. On low hp engines a true roller rocker may gain 5 hp. When you got high enough in spring pressure to be deflecting the rocker, you could see 10-15. On race engines that roller rockers were required, we would see sometimes another 10 going to a 1.6 on the intakes. But on a magazine engine, you could put stock rockers on a race engine, and make horrible HP. Then when you put 1.6 rockers on it and make 30-35 hp everybody oohs and ahhs about it. So in the grand scheme when you are doing multiple things and looking for 5 here and there and it all adds up, roller rockers help. But to just put a roller tip rocker on an engine, you won't notice any difference.
