[Steve C.]

More often than not calling Lunati is similar to calling Comp Cams tech. Depending on the cubicle your phone call is routed to Comp often just regurgitates the use of their 995 valve spring.
Similar to Lunati with almost all their hydraulic cams, including the Voodoo line, they say to use their 73949 valve spring.

From Jegs:

Lunati 73949 Dual Valve Springs
Seat Load: 120 lbs/in @ 1.650

From that you need to evaluate your installed height.

Some might even suggest less pressure, a low 113-115 lbs has been suggested.
That is quite a bit less compared to Paul Carters actual experience, including his dyno testing Voodoo lobes.
Regarding that low amount, Paul's response...

"They will be a little weak. You need to shoot for 125-130 lbs. on the seat, and over 300 open with the 30° intake seat. Otherwise you might experience valve bounce from the flat seat angle.
The Voodoo cam has a very gentle closing ramp, but still the 30° seat needs pressure."

And I will suggest that is probably his suggestion for a minimum and AFTER they have lost a bit of pressure with run in.

No matter what brand just remember never trust catalog stated pressures, they can and do vary. Test them at your intended installed height with the retainers you plan to use.


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