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Dual valve spring ? single spring? #950283
03/13/11 10:59 PM
03/13/11 10:59 PM
Joined: Aug 2010
Posts: 164
mesa arizona
moturbopar Offline OP
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moturbopar  Offline OP
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mesa arizona
Hi all i am in the middle of my 360 engine build, and am looking at running either a voodoo 60404 or a comp xe275hl. I originally planned on using a comp xe268 but have been thinking about going bigger.
The problem is my heads are already built using comp 901-16 single springs. The comp and voodoo want dual springs. From what I was reading the heads need to be machined for the dual springs. So I was wondering if there are any single springs that are available that will work with either of these cams, so I dont have to pull the heads off????
Thanks

Last edited by moturbopar; 03/13/11 11:00 PM.
Re: Dual valve spring ? single spring? [Re: moturbopar] #950284
03/13/11 11:05 PM
03/13/11 11:05 PM
Joined: Aug 2010
Posts: 164
mesa arizona
moturbopar Offline OP
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If not do you guys think that the xe274 would work with the 901-16s? they call for dual springs also, but doesnt seem too much more of a cam than the xe268.

I found these while looking over the hughes website.
http://www.hughesengines.com/Index/produ...mp;partid=10256

Last edited by moturbopar; 03/13/11 11:18 PM.
Re: Dual valve spring ? single spring? [Re: moturbopar] #950285
03/13/11 11:31 PM
03/13/11 11:31 PM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
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The cam doesn't care whether you run single springs or dual springs, so long as you have the necessary spring pressure and don't have coil bind. I'm not sure about comp but I know for sure lunati's website tells you how much spring pressure they want instead of only telling you which springs to buy.

Re: Dual valve spring ? single spring? [Re: DaytonaTurbo] #950286
03/14/11 07:30 AM
03/14/11 07:30 AM
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Upper Midwest
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MoparforLife Offline
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Remember there are dual springs and there are single with a damper. 2 different things.
dual springs will require machine work on the heads for the inner spring. single with dampers do not require this.

Re: Dual valve spring ? single spring? [Re: MoparforLife] #950287
03/14/11 10:37 AM
03/14/11 10:37 AM
Joined: Apr 2010
Posts: 1,216
Under My Car
Mopar_Country Offline
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Under My Car
The specs on the 901's do not match what the other cam wants. It would be best to replace with the correct ones. They also look like a spring and damper set up. You can change springs with out removing the heads.

Re: Dual valve spring ? single spring? [Re: Mopar_Country] #950288
03/14/11 11:01 AM
03/14/11 11:01 AM
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Upper Midwest
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The coils on a damper spring are flat as in the pictured spring.

6529415-springs.jpg (82 downloads)
Re: Dual valve spring ? single spring? [Re: Mopar_Country] #950289
03/14/11 11:07 AM
03/14/11 11:07 AM
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Cincinnati, Ohio
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superbeedave Offline
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The XE268 cam only requires single with damper, That is the cam I put in my 383 a couple of years ago. Or just go to their web site and see which springs they recommend for this cam. I know they call for an installed height of 1.900.

Re: Dual valve spring ? single spring? [Re: superbeedave] #950290
03/14/11 11:36 AM
03/14/11 11:36 AM
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Florida
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scratchnfotraction Offline
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Florida
the comp 901-16 single/damper will work with any lunati sb voodoo cam

they are withen 10 lbs of the duel/damper lunati springs that are speced for all the sb mopar cams

i run them on my 360 headed 318 with a lunati voodoo roller cam 60710

258/264
207/213
.485/.458

droped on with stock seals and retainers with heads on engine

been 6200rpms and no valave float with the used stock roller lifters

also run a 360 with a lunati 292/292 bracket master cam with the comp 901-16 with no trouble

built 2 more engines with voodoo cams and the 901-16


Re: Dual valve spring ? single spring? [Re: moturbopar] #950291
03/14/11 12:10 PM
03/14/11 12:10 PM
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dearborn heights michigan usa
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brianw Offline
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dearborn heights michigan usa
try pac spring they make a great spring with allot of choises

Re: Dual valve spring ? single spring? [Re: brianw] #950292
03/14/11 12:18 PM
03/14/11 12:18 PM
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Upper Midwest
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MoparforLife Offline
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Too many people believe that more is better. NOT SO. Too much spring results in problems.

Re: Dual valve spring ? single spring? [Re: MoparforLife] #950293
03/14/11 12:31 PM
03/14/11 12:31 PM
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U.S.S.A.
JohnRR Online rolleyes
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JohnRR  Online Rolleyes
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Quote:

Too many people believe that more is better. NOT SO. Too much spring results in problems.




As does too little ...

Re: Dual valve spring ? single spring? [Re: JohnRR] #950294
03/14/11 12:49 PM
03/14/11 12:49 PM
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Posts: 25,200
Upper Midwest
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MoparforLife Offline
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Quote:

Quote:

Too many people believe that more is better. NOT SO. Too much spring results in problems.




As does too little ...


I agree but it seems that there are by far more instances of people that think that more is better than there are that think the other way.

Re: Dual valve spring ? single spring? [Re: moturbopar] #950295
03/14/11 03:41 PM
03/14/11 03:41 PM
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Posts: 5,892
Florida
Locomotion Offline
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Florida
Comp Cams 926-16 are some of the stiffest single springs that they have. I don't know what your installed height is, but was wondering if they might work. You can always get + or - locks and/retainers to make some adjustments.

Re: Dual valve spring ? single spring? [Re: Locomotion] #950296
03/14/11 04:06 PM
03/14/11 04:06 PM
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Upper Midwest
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Normal installed height on SB is 1.65/1.70. Watch the clearance between the seal/guide and retainer too.







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