The middle lobe has enough lift that with a stock Grizzly spring it will bind and possibly break the rocker arm or worse yet drop a valve. While you have it apart you might as well install all the valve springs.
i guess i should have made it more clear,sory.i ment change them all to rapter springs or just the middle one and put new grizzly springs in for the rest of the valves.
by the way thank you for the help,this info is actually for my brother in law.he has a 03 grizz.
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