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Old 05-10-2010, 10:48 PM
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valvespring question

I am hoping someone can offer some advice on some small block Edelbrock RPM valvesprings
on the Edelbrock RPM heads for my SB 350.
I talked with a guy at Lunati and he said they would be fine but just wanted a second opinion.

I am putting this Lunati hydraulic roller cam in my truck didn't want anything too radical.

Part Number: 60110
•Advertised Duration (Int/Exh): 262/270
•Duration @ .050 (Int/Exh): 211/219
•Gross Valve Lift (Int/Exh): .507/.515
•LSA/ICL: 112/106
•Valve Lash (Int/Exh): Hyd/Hyd
•RPM Range: 1600-5600
•Includes: Cam Only

and the recommended Lunati springs are PN #73943: (Btw Lunati recommends this spring for all the Voodoo retro Hydro. roller cams seems ***?) They are billet cores.

•Spring Type: Single w/damper
•Outside Diameter: 1.266 in.
•Inside Diameter: 0.883 in.
•Seat Load: 108 lbs @ 1.750 in.
•Open Load: 339 lbs @ 1.250 in.
•Coil Bind: 1.060 in.
•Spring Rate: 462 lbs/in.

According to the instructions the Edelbrock RPM springs are:

Installed Height (in) 1.800 in.
Seat Pressure at Installed Height (lbs) 120 lbs.
Open Height (in) 1.250 in.
Open Pressure (lbs) 320 lbs. @500 lift
Valve spring diameter 1.45

Will 19lb's difference in open pressure really matter or could I just shim it for more?
Or will it be ok like the Lunati guy said?

I would buy the Lunati springs but they are different diameter.

Also what about PTV clearance with dish pistons and stock in the hole .025 with that cam. I was planning on double checking to be sure.

I am gonna try and use the felpro 1094 .015 rubbercoated steel shim gaskets.

Thanks in advance.

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Old 05-11-2010, 04:45 AM
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Personally, I would run the RPM heads and springs as-is w/the Lunati cam.

You should always verify the clearances throughout the valve train.
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Old 05-11-2010, 03:46 PM
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Quote:
Originally Posted by cobalt327
Personally, I would run the RPM heads and springs as-is w/the Lunati cam.

You should always verify the clearances throughout the valve train.
Thanks I appreciate your opinion and I am planning on checking everything.
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Old 05-12-2010, 09:45 PM
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Ok here's an update. I wanted to be sure here since these parts are very expensive $500 lifters over $300 cam etc so I took the heads to a local cylinder head shop local Cylinder Head Service (Fairfield,AL.) where I also know the owner (should have went there all along).
They checked the Eddy springs and they were much lower open lift than Eddy said they were something like 270# open and 108# think on seat.

CHS installed some dual springs w/ dampner that are not mushy like the Eddy's so I now I feel more better about them.
They Eddy springs might have been disastrous to use here.

Last edited by HOGDADDY; 05-12-2010 at 10:29 PM.
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