Roller rockers?

[harleypauls]

I need to put better set-up under the valve cover for my friends merc 500. Any one have any reccommendations? We are trying to keep up with the newer 525's. I am looking for more mph. Paul

[Moneypitt]

The most expensive rockers in the world won't help unless something else is also changed, like a lot of something else. The only possible performance improvement would be a higher ratio rocker arm. And I really wouldn't recomend doing that because it really screws up the cam geometery. Try a little juice........MP

[GofastRacer]

Roller rockers do not make horse power, they reduce friction which in turn free up horse power, if it's there!..

[Kurtis500]

Stainless steel rollers are good...and expensive.