How much work is it to replace all the valve springs? Do the heads need to be removed or anything? About how long should it take to replace them?

 

It took me about 2-3 hours to replace mine but I also did cam, pump,etc.
Heads stay on. Just remove valve covers. Get the Larry Tool. It works great.

Bill

 

I got mine done in about 1.5 hrs using the crane tool.

 

Here's the best tip we can give you on that. Go to www.LS1howto.com - It will show you step by step how to do that. Good luck!

 

Is it more common to break an intake valve spring verse the exhaust valve spring? This is the second time I have broken an exhaust valve spring and both mechanics thought it was strange that it was the exhaust spring that broke.

 

Not sure which break more often: Exhaust or Intake Valve Springs. Which springs are you breaking. Are they the stock springs or an aftermarket valve spring? The reason I ask is if you are making 375 rwhp and you think you have a stock cam, I'm betting there is an aftermarket cam in your car (assuming you bought the car used and don't know for sure). You may want to put a dial indicator on the rocker and measure the lift, stock should give you around .5" times 1.7 rocker arm ratio for a total of .85 inches. If you are running stock springs with an aftermarket cam you will start breaking them right and left.

 

with the crane tool it ahouldn't take you any longer than 1.5 hrs to change all springs.

 

 

I bought the car new. Mods are in the sig. They are Manley springs. Everything installed and tuned by SLP.

 

What cam?

 

SLP cam.

Camshaft Specs: Valve Lift Duration Duration@.050 in: .559" 267º 214º ex: .566" 275º 222º

 

Another vote for the Crane spring tool. Just did the cam last week and my first time changing springs on a LS1. It was quick and easy.