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Old 03-22-2008, 01:18 PM
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Valve Spring Pressures for Roller Cam - BBC - Help

Guys

I need another opinon please...........

Without naming part numbers and manufacturers for the setup I'm running. Please help answer this question with you best experience answer.

I'm running a BBC in a Performance Street car. I put about 500 miles a year on it. In the process of re-assembling the engine. I installed a solid roller cam - billet core. The cam has a lift of about .650" on both intake and exhaust (with 1.7 rockers). It's an "aggressive" cam lobe profile (extreme energy). I never plan on revving higher than about 6400 RPM.

My valves have an installed height of about 1.90". I have GM BBC Iron Oval port heads. Spring Pockets are about 1.550". I'm running Isky RedZone Roller Lifters.

WHAT VALVE SPRING PRESSURES ARE BEST SUITED FOR MY APPLICATION?

WHAT IS THE RECOMMENDED SEAT PRESSURE (APPROX)_______?

WHAT IS THE RECOMMENDED "OPEN" PRESSURE (APPROX)______?
thanks

Lee
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Old 03-22-2008, 02:16 PM
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225 seated, 450-500 open.

tom
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Old 03-22-2008, 04:07 PM
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Quote:
Originally Posted by machine shop tom
225 seated, 450-500 open.

tom

thanks Tom -

More feedback please ...............
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Old 03-22-2008, 08:05 PM
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Lee... Have one question...? Are the guides stock or have they been cut any...?
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Old 03-23-2008, 06:01 AM
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Quote:
Originally Posted by Bumpstick
Lee... Have one question...? Are the guides stock or have they been cut any...?
they are stock 3/8" as far as I know - why?
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Old 03-23-2008, 10:39 AM
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One more thing to check when you set up the springs. Make sure that they are at, or very near, 90% compressed at peak lift. This will help a geat deal.




Larry
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Old 03-23-2008, 03:35 PM
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Quote:
Originally Posted by leejoy
thanks Tom -

More feedback please ...............
If you plan on that little of use, probably wouldn't hurt to remove all rocker arm tension on them when you expect it sit for long periods of time. It will help the springs tension last longer and also keep all the valves closed so a draft isn't created and moisture from entering some of your cylinders and causing problems there if it is humid and not in a good climate controlled environment....info that tom gave is accurate on open and closed rates!
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Old 03-23-2008, 05:12 PM
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Quote:
Originally Posted by leejoy
they are stock 3/8" as far as I know - why?
He means that you have to check for retainer-to-seal interference.


tom
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