Any input on what shaft mounted rockers to use?

[Caprimaniac]

Hello again, Brent.

Yes, I see your point. But remember that this cam/ lobe profile (no, I didn't change it) is supposed to work WELL with 155 seat 420 open springs. And I don't think the engineers at Comp are that stupid, to be honest. I guess this means the cam has very "kind" open- and closing ramps.

The "wildest" I would dare to go (as a start) is 173 seat and 450 open (installed spring @ 1.850).

As you know, it's a waste to use too stiff springs. If someone comes up with a formula how to compute the "ultimate" valve spring for a given combination, I will gladly like to try it out.

As a fact, while I put up the "what valvesprings to choose" poll, most voted for the comp standard values for the cam.... But that doesn't tell us anything, does it?

But, it's kind of hard to choose when you have to guess.... On the other hand, I have no problem taking the valve springs off to shim the springs while the engine is in- in case of finding valve float or other problems during testing/ dyno.

Hey, someone: pick up my data and show it into your formulae. Let the math tell us the numbers. One of the few things to trust: exact science never go wrong.

Let me think for a day or two- or until someone comes up with the formulae.

RS