yes, the dual will extend valvespring life...however, it does so at the expensive of valvetrain stability. they are heavier and add more weight to the valvetrain, making it more susceptible to poor valve control @ high rpms. however, with the lightweight valves, i think gains would be minimal at best when compared back to back with that particular cam.

big cams (that perform equal to their size) will not be low maintenance.

 

another vote for the lg g5x3, i love mine nasty idle.i went fom a tr 224 to this cam,lost some lowend but with 4.11's it wasnt that noticeable.

 

I'm sorry but I was refering to the Torquer V2 cam, my bad. I have the card to prove it.

 

No big deal man. As far as the TQR V2 is concerned, you're 100% correct, it is ground by Comp on XER lobes

 

This phobia that a lot of poeple have about 918 springs is totaly unfounded.
Putting duals on LS6 valved heads is retarded in my opinion.
You want more horsepower, then do it right with the already high quality parts available in the Z06.
As for putting duals for the sake of "piece of mind" only means that you are unwilling to maintain the car after modding and you are being a lazy ***.
The 918's are better springs than 90% of duals with regard to harmonic control and power output on any cam in the .600 lift range.
When was the last 918 failure that you've seen here if all was installed properly.
My moto is "do it right or don't do it at all"
That means, degree the cam, match the components carefully, tune it properly, and maintain it regularly.
I just can't see the need to go backward on such a well designed machine such as a Z06.
Think about it this way, if LS6 valves were not so beneficial, why are stock LS6 heads worth 1200$ stock and LS2 heads only 475$ ???
They are the same except for the valves.

My point is you already have good parts, why ignore them instead of benefiting from them?

 

The only input I have is that the ms3 is a great proven cam that loves the n2o. I daily drive this cam and my engine has never failed or let me down once. The car dosent have much buck at all at low rpm's even before I had jason at tsp tune it. I get around 27-28 mpg on the highway with this cam and about 16-17 in the city sometimes less, but thats because I have never once since Ive installed it been able to keep my foot out of it, so im not positive on the best city numbers. cant go wrong with the ms3 if your lookin for over 400rwhp cam with a nasty idle.

 

NOOB QUESTION... what kinda maintainance you have for cams? i have the T1 221 / 221 on a 114.

 

you don't have as big of a cam as the cams they are talking about but the springs will wear out after sometime... with your cam I would say 20k (don't count on that and it would be very beneficial to check at 10k) with the cams like the ones these guys are talking about 12k ?? just guessing tho

 

Spring maintenance.
Every year or 15K miles you need to remove your springs and check their pressure specs. If within range then you are good for another 10K if not, time to change.

 

Haha you make good points but for us lazy guys the duals do the job well...plus not many people know how to shim springs correctly nor can they do them themselves. I am not experienced enough to shim them myself and plain do not have the time to be digging around in the valvetrain checking on my springs to see if they need to be replaced, therefore I went with the PRC duals since the lift on my custom ground cam is .630 intake and .6XX exhaust. If your up on maintainence then by all means go with the shimmed 918's as Predator knows tons about valvetrain combos and im sure they will work great with the LS6 valves. BTW Predator do the ls6 valves need to be switched out if duals are used or do they just not work as well as the lighter 918s?

 

Is anyone familiar with the MTI X1 cam? What kind of gains could be seen from this on my car?

 

PRedator Z -

Quick question about springs - I have the Comp 921 with my Z that was done by Lou G of LG Motorsports. It was in his cam kit. As I am not as familiar with the 918's, are the 921's not good? I have 475/422 on 13:1 AFR. It pulls a lot more if I lean it out (My AFR heads can take more).

Thanks,

JG853

 

buy a fast intake and then sale me your ls6 intake

 

While I think Predator makes some very valid comments we also need to take into account the recommendations that are made to us and others by not only the cam manufactures but our engine builders as well.
I was told by TSP to use a dual PRC springs on my Torquer V2, which I did and I rountinely spin the motor to 7200 rpms. I've checked the valve train several times and no trouble, things look good and I'm making over 480 rwhp in my ZO6.
And yes these LS6 heads are excellent as is, but going to a large cam over .600 lift with agressive lobes might require different springs. (I said might).
Along the same line my sons GTO broke a spring (ETP) and if it werent for the duals things would have been nasty. We changed them all to 921's and the valve train is actually quieter.
I took a tour of Katech recently, thanks to Jason and he was telling me of the success they have had with the beehive springs. The main reason for this is that they are lighter and the motor (LS7) doesnt need to spin that high to make power so they can get away with a lighter spring. And they have better harmonics than some of the others.
I truly believe that anyone putting together a quality motor need to research all the options. I myself believe that if you are going to do it, do it right the first time. I researched and asked questions for months before settling on my current combo and if I had to do it over again I wouldnt change a thing. How many people can say that? Probably only a few.
I'm lucky as I'm in the middle of some the best race shops and engine builders in the country and I was able to draw on some of thier experiences.
Remember its the sum of the whole that will make your results worthwhile.

 

Are you serious? The 921's are the best money can buy that's why LG sells them with their cam kits and they cost more than double than the 918 single
springs.

 

I think that some of you are not getting what preditor is saying. I aggree with him in that with the light valves and titanium retainers it requires less spring and putting a dual spring setup on all the lightweight valvetrain is taking away from it.

 

I can't see that shimmed 918's vs Duals will really make a significant difference in power or track times compared to the duals. What will you gain, a couple HP? I think most would rather have the safety and increased longevity of duals vs the exta 2-3 hp.

I have to believe that a respected corvette vendor, LG Motorsports, packages these cam kits with Dual springs for a reason

I don't claim to be an expert on this subject so someone please correct me if I am missing something here...

 

I see both point of views. I myself, will go with 921's. For reliability.

 

I would think the MS3 and 918's would be a BAD combination, not good. The 918's are only rated to.600 lift and the MS3 is .603/.609, XER lobes with aggressive ramp rates and that lift which is beyond what the 918's are rated at, just to gain a few extra ponies from the less weight of the 918's? I'd definitely not feel comfortable with that.

 

Valve springs are a return energy componet if you will. Going to a lighter spring does not always equal more HP. A valve spring job is to keep the roller/tappet in contact with the lobe at all times. And to do this sometimes a heavier spring pressure is needed ecspecialy at higher lifts and aggresive ramp rates.