Looking at TSP's cam kit...
 

I want to get a 228R cam. It's got .588 (as most know) and i was wondering if i should get the PAC 1518 valve springs good for .650 lift for extra insurance? Or just stick with the PAC valve springs good for .600 lift?

Thanks,
Jeff

The PAC 1218's will have no problem holding the 228r cam, you will just see more life from the 1518s. We have never had an issue with a PAC spring so you can't go wrong either way.

More life as in how long?? Also the 1518 wont rob power in any way will they?

I would expect the 1518's to put up 5-10k more then the 1218s. The 1518's won't rob any power at all on a cam like that.

Im looking ar a TSP cam kit myself in the near future.

whats the expected life on valve springs?? I assumed they would never really fail. Stock ones last 200,000km+ all day long in vehicles and when you get that high, whats another 5-10k?

Im curious myself. I never really thought of that. What is the expected life on a performance valvespring on a cam car?

I would expect the 1218s to last around 20-25k miles on that cam, while the 1518s will work for 30-35k. All aftermarket valvesprings wear out over time, especially when used with the larger more aggressive aftermarket cams.

Dual valvesprings will last a lot longer on this cam. I would expect our PRC duals to go at least 45-50k before needing to be changed.

you need to do some kind of machining for dual though correct??

I cant belive they would wear out in like 50km's. Interesting.

Is machining required to run doubles? Also how much power is lost through doubles due to the fact of more effort needed to compress them over singles?

How high are you revving this engine? Will valve train stability be a super crucial issue? I would go with springs rated closer to your lift for higher revving and/or for more stability. I am planning on adding shims to get mine within 0.050 of coil bind. Just adding more stability to the already maxed out stock valvetrain

its not going to be crazy, im thinking 6000-6500RPM max

pac spring are good i have delt with them alot cant hurt to be on the safe side

so whats the final verdict here?? Go with the 1518's (.650 lift) for the extra $25?

Its up to you, it sounds like the only real difference will be the valve life on that set-up. I'm going with the same set-up with the 1518's. The only thing I have left is to pick an LSA.

25 bucks extra to delay a valve spring swap another 10k miles hmm.......hells yeah i would go for that!

yeah that's a no brainer.

I would go with the 1518s in your situation

TSP sells the pac1518.