Valve Spring Question

[satellite65]

I'm switching cams to a Comp XS268S solid. Valve lift is .488" in /.501" ex. Duration is 268* in / 274* ex. The springs on the left are what Comp recommends. The Crane on the right are what I have now. They are in perfect condition. Can anybody tell me if I can use my existing springs or should I pony up for new ones. If I call Comp Cams I'm positive what the answer would be, just want some "unbiased" opinions.
     
Brand
COMP Cams                                      Crane Cams

Part #
CCA-911-16                                     CRN-99893-16

Coil Bind Height (in)
1.200 in.                                          1.080 in.

Damper Spring Included
Yes                                                 No                       

Number of Springs Per Valve
Single (w/damper)                            Dual

Spring Rate (lbs/in)
373 lbs./in.                                      391 lbs./in.

Thanks,
Steve

[bOb shingler]

use the crane's, they are a better spring.

[satellite65]

The differance in spring rates is minimal? Nothing to be concerned with?

[68_Val_Sedan]

use the crane springs ... the difference is rates is a non issue ... the coil bind is also better with the crames ...

[satellite65]

Thanks guys. This project just keeps getting better each day.

[satellite65]

And one more question..................
When I run in this cam for the first time, should I yank the inner springs out?                                                              Just for the record, these springs were used on a M.P. 280*/.474" cam. This cam was broken in (20 yrs. ago) with the inner springs left in place, moly lube on the lobes and the Mopar oil additive. The cam looks as good as the day I installed it. Maybe the oil WAS in fact better back in the good ol' days.

[bOb shingler]

for used cam with the lifters that are mated to their respective lubes just moly lube the lubes and lifter bottoms and install both inner and outters and have at it because it's already broke in.

[satellite65]

Thanks for replyiing back bOb but I think you may have misunderstood. I'm not re-using the cam and lifters, just the springs. The only reason I mentioned it was to illustrate that I didn't go to great lengths on the last cam break-in. Just proper assembly and a good 20 minute run-in with no problems. With all this nonsense about zinc (or lack of) I wanted to find out whether I should pull the inner springs for break-in.

[bOb shingler]

it certainly won't hurt anything to remove the inner spring but i have to caution you on putting them back in with the heads on. that heads on spring compressor is a bear to use to get them back on because it doesn't compress the inner spring and it has to be compressed with muscle, not a fun job to do.

[68_Val_Sedan]

I broke mine in with the springs installed ... no issues ...

[deadly dart]

Use the Crane spring installed at 1.875"  It will give you about 120lbs seat pressure and because of the spring rate and the lift of your cam, you are so far way from coil bind, that the spring will not generate a lot of heat which between that and coil bind are a springs enemy. The over the nose pressures will also not be so great as to cause accelerated wear with todays less than great oils.