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Location: PuebloWest, CO.
Re: Which valve springs for mild hydraulic roller ?
Originally Posted by nashville beth
They are right on the borderline: 120 seat pressure, 320 lbs open.
You are correct, I could probably get by for a while with them.
But with wolfies rotating assembly, I really want to push it to 6000+.
I just don't trust those springs.
I am setting up same heads rpm performer O you have, with the same cam they swapped into that zz502 in the article. The .230/.236 .598 .610 112lsa. and my cam card shows 2 different springs based on lifters used. I am using the same springs you already have shimmed to 1.900. The spring pressure is actually pretty correct for your lifters and cam once you set them up at the lower height. The pressures at the 1.975 installed height is on the edge but once you shim them to the 1.900 the seat and open pressure goes up some. That is the way it was explained to me, if I was told wrong I will be looking into more spring pressure.
My cam is billet and I have the isky lifters so I could go with the second spring rate crane recommended for this cam, and it is the same spring they used in that article the crane 96878 but it says you have to use a aftermarket lifter like my isky's with those higher spring pressures.
If your gonna change springs why not get a spring that will work with your current retainers, locks, shims and locators? The thing is you could use the crane springs setup at the stock 1.975 height and that would lower your seat pressure and but still might be too much at max lift. The edelbrock springs the .125 seat at 1.975 becomes .135 seat at 1.900 or close to it. in a simular fasion raising the crane's to 1.975 lowers the seat some. If I am wrong sure Wolfy or one of the others more in the know will correct what I was told.
I got my heads bare so am setting them up with crane locators, but everything else is all edelbrock parts I picked up along the way, new take off's and what not. Valves are elgin 21-4n and rated to .500 spring pressures.
By the way the spring they used: Various solid roller applications for Pro Street and Bracket use. That is from the crane web site.
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Last edited by Jebchevelle; Apr 18th, 19 at 7:27 PM.
Reason: height suggestion