Does anyone know how much extra lift adding a set of 1.6 ratio rocker arms adds over the stock 1.5's? With a .462 inch lift cam on the exhaust side, and running stock valve springs, I wouldn't want the 1.6 rockers to cause the cam to exceed .500 lift and stack the valve springs.

.4928 of lift if you went to the 1.6's vs 1.5,s

Andymiller is right with the "new" lift #'s.

Here's how you determine it for yourself. Take the advertised valve lift for the camshaft. It's advertised using 1.5 ratio. Divide the advertised valve lift # by 1.5 and you determine your "LOBE LIFT". Whatever that # is can be multiplied by 1.6 and you now know the valve lift using the 1.6 ratio rocker arms and can see the difference. A 1.6 ratio will also slightly increase the duration of the cam, but I'm not sure what the formula is to determine that.

Like andy said.........

Lift at 1.5 ratio x 1.6 ratio/divided by 1.5 ratio..

.462" x 1.6/1.5 = .4928"..

pdq67

This is simple
Rocker arms multiply the cam lift (or lobe lift). A 1.5 rocker arm multiplies cam lift by 1.5 a 1.6 multiplies by 1.6 ect...
So working backwards to get cam lift.
4.62/1.5 = 3.08 cam lift
Now we can take the cam lift and find out the valve lift with a 1.6 rocker
3.08 x 1.6 = 4.928

Or you can multiply the 1.5 ratio valve lift by 1.066 to get within .001 or so of the true 1.6 number.