The Purpose Of 1.6 Rockers

The difference betweeen a 1.6 Vs 1.5 is 7% so if you have a 520 lift cam the 1.6 rocker will bump the lift by 7% or to .556.

All 1.6 rockers is a Chevy deal, a Mopar WILL make more power with a 1.6/1.5 rocker combo. By putting a bigger lift on the intak side you get the Air-In higher wih the bigger lift. The key to scavenging the combustion chamber is velocity and by leaving the 1.5 on the exhaust you will increase that vlocity and scavenge the Combustion chamber cleaner=More power.

Bigger is not always better, you have to do the calculations and understand the physics of an internal combustion engine and how valve overlaps relate to scavenge based on lift, duration, port sizes, header tube legnth and size, valve size, rocker arm rations etc. Changing the rocker arm ratio is NOT the same as splitting the lift on the cam lobe.

Changing the rocker arm ratio does almost nothing to the duration. If you really want the inside scoop on how a split ratio rocker arm system works give Jim at Racer Brown a call and he'll explain it in detail.

Racer Brown Cam Engineering....410 866-7660 after 2 PM EST

Here's Jimmy's set up
http://www.4secondsflat.com/Racer_Brown_Rocker_Arms.html