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Lazer-10
05-24-2011, 09:15 PM
How often should a 604 valve springs being changed and does anyone know the GM part number
BPRacing29
05-25-2011, 06:13 PM
I change mine every 10 races or 300 laps.

GM part # is 12495494 - set of 16


BPRacing29
Lazer-10
05-25-2011, 08:34 PM
Thank you for your help on this matter
Matt49
05-26-2011, 08:36 AM
300 laps give or take.
You should also just go ahead and change the caps and keys while you are in there.
GM part number 19171528 for a set of the caps and GM part number 12495503 for a set of the keys. About $30 gets them both and it's worth it just to have them on hand in case you find a problem while you are changing springs.
sikjeep
06-08-2011, 04:01 PM
I was told by a good source that this years springs are crap. I dont want to change mine now.
Matt49
06-09-2011, 08:32 AM
I was told by a good source that this years springs are crap. I dont want to change mine now.

The springs have always been crap. That's why a lot of people buy about 50 of them and pick the best ones out and scrap the rest just to make sure they have a reasonable set of springs.
car23
06-11-2011, 01:37 PM
can u buy them individual and whats the part number?
Egoracing
06-12-2011, 11:22 AM
can u buy them individual and whats the part number?

You used to be able to but the cost of 3 or 4 was more than a complete set with retainers and keepers.