I thought that too. If I ran my stock valve springs, how do I tell if I have valve float?

You'll know if you have float. It will be like hitting a brick wall. It kinda seems like a rev limiter.

Shawn

Read the artical... 105'* will take less power away and have less strain on the dampner then LS6. Stock springs will take the least power away and the least strain.

I ran 105# and 1.9s for about 6 months before I moved over to the cam. No problems here. Pretty much everyone with 97'* and 1.9s have done this with no problems as well.

That'* good to know. I've read that they are overkill, but if not, I will consider them.

They are overkill and will wear out your heads quicker, however due to the spring rate they are easier on your timing chain/tensioner than the 90lb or LS6 springs. Personally with 1.9'* I would run stock springs if you don't plan on turning more than 6k rpms and then if you do get valve float change them out for stronger springs. Because if you don't get float that money you saved on the springs could be spent elsewhere. Just my $.02. But I do recommend springs to anyone turning more than 6k, most rocker cars however don't make any power up there and have no reason to spin that high, which is why I don't typically recommend them to people. Both of the rocker cars we currently have run completely stock valvetrain besides the 1.9'* and they have no problems. One has stock shift points, the other has 6k shifts.

Shawn

It seems like it would be a gamble to run stock springs though. If there is float, then it would take all that extra time to pull the engine apart again.

Also, what if the springs are very old ... say on engines with 100K miles or more?

Well, here is the deal. I'm sticking with the stock springs but when I get the DHP I will have it shift at 5950 rpm. That way I should be safe and get most of the power out of the rockers, correct? BTW- The high flow cat was installed today and that in itself gave a slight gain on top end.

Our SSEi has 160k+. Its had rockers since 70k with no float problems at all, shift points are at 6k.

While it is somewhat of a gamble to run stock springs, its not really that bad to take the engine apart to change the springs, and imagine doing all the work of changing the springs, and dishing out the $ for them, if your car would've been fine without them. You come out ahead either way depending on how you look at it. If you're not planning on shifting over 6k I'd leave the stock springs in.

Shawn

I'm sorry but this makes no sense. The higher the spring rate the higher the stress on your valve train. :?

Sure more power can be made at higher rpm'* if the torque does not drop off due to higher lift but look at how much time it takes to go from 5750 to 6000 rpm.....about .1 sec.