360 magnum head valve springs?

[63dartman]

I am running the Lunati LUN-60401LK they recommend a dual spring with a number of:
Part Number: LUN-73949
Number of Springs Per Valve: Dual
Outside Diameter of Outer Spring (in): 1.440 in.
Coil Bind Height (in): 0.950 in.
Damper Spring Included: Yes
Spring Rate (lbs/in): 363 lbs./in.
Inside Diameter of Outer Spring (in): 1.070 in.
Inside Diameter of Inner Spring (in): 0.745 in.



Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 1,000-5,500
Intake Duration at 050 inch Lift: 213
Exhaust Duration at 050 inch Lift: 220
Duration at 050 inch Lift: 213 int./220 exh.
Advertised Intake Duration: 256
Advertised Exhaust Duration: 262
Advertised Duration: 256 int./262 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.454 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.475 in.
Valve Lift with Factory Rocker Arm Ratio: 0.454 int./0.475 exh. lift
Lobe Separation (degrees): 112

I am running the magnum heads and wanted to know if the springs from the non magnum heads will fit in the magnums? If not, where would I get the right springs for my application? Thanks

 

[needsaresto]

Magnum R/T spring will work. Its a mopar part.

Read this thread for more info.

http://www.forabodiesonly.com/mopar/showthread.php?t=2477

 

[Coyote Jack]

A dual spring is pretty heavy for that cam profile. I would think that a single spring with a dampener would do the trick. MP has 2 springs for the magnum heads and there are a few alternatives. Patrick over at Moparts has all the info on what works and what doesn't.

Jack

 

[mopar1962]

that cam profile is definitely wrong .050 numbers arent right. call jegs for proper specs. 1-800-345-4545

 

[mopar1962]

my mistake, misread chart,sorry

 

[dgc333]

LA springs will require machining of the spring seats on the head, for a dual spring you would likely need to machine down the diamter of the guide to. The other problem with LA springs is there are no retainers out there (that I could find) that fit the spring and work with the 8mm magnum valve stem.

When I did my magnum \ LA hybred I used a Comp XE268H cam which is about one step up on duration and more lift. At the time Comp did not offer any springs and recomended the Mopar Perfromance R/T spring which is a single spring and damper. These springs work fine right up to 6500 rpm on my engine so they should be fine with the smaller Lunati cam. NOTE: these springs also require new retainers but retainers from a 2.2/2.5 mopar 4cyl work. You can get them from MP, a dealer or do as I did and harvest them from the local junk hard (use the magnum locks).

Mopar Perfromance has another spring beside the R/T spring that is good for .600" of lift and Comp now has a beehive spring that fits without needing any machining of the head.

 

[63dartman]

Thanks guys, I will be looking into the comp beehives and the RT springs.