![]() Note how changing from the stock ratio, which is actually closer to 1.46:1, to a true 1.60:1 will increase your total valve duration by almost 20 degrees! This geometric increase is true for any cam in any engine. At the same 6,000-rpm peak, we made 401.1 hp and 412.9 lb-ft of torque, a gain of 11.2 hp and 5.9 lb-ft of torque. First, a rollerized rocker fulcrum reduces energy losses from mechanical friction in the drivetrain, freeing up horsepower. What is the difference between 1.5 and 1.6 rockers? Do roller rockers add HP? But, that engine was equipped with a smaller cam than this one, and it seemed to really need the additional lift and duration afforded by the higher ratio. Those results found the 1.6 rockers making more than 20 hp over the stock 1.5 rockers. ![]() 4 inches: If you do the math on a set of 1.6:1 rocker arms: Multiply 1.6 x. What’s the difference between 1.5 and 1.6 rocker arms?Ī 1.5:1 rocker arm will move a valve 1.5 times the lift of the cam, assuming all things are in proper working order. It doesn’t sound like much, yet it was enough to show a sizeable gain, mainly because it increases the amount of time that the valves are open at higher lifts, allowing more air to flow through the heads. With a 1.6:1 rocker, this gives us 0.508-inch valve lift at max lift, an increase of 0.031 inch.
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