Cliff98Z

I know this has been beaten to death, but will LS6 springs be OK with stock LS1 valves with a 2002 LS6 cam? I have heard conflicting statements about the LS1 valves being to heavy and such.
Thanks

Jay 95WS6

yes it is fine

Gary Z

The 02 LS6 valves are considerably lighter and more expensive than LS1 valves. Did GM use expensive, exotic valves just to raise the rev-limt to 6500 from 6200?

Cliff98Z

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Gary Z:
<strong> The 02 LS6 valves are considerably lighter and more expensive than LS1 valves. Did GM use expensive, exotic valves just to raise the rev-limt to 6500 from 6200? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">What are you trying to say? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" /> There are plenty of stock valve cars spinning more than 6500 rpm, I just wanna know if the LS6 springs will hold.

Gary Z

I am not saying anything – I am interested in your question. Obviously LS1 valves will be fine with the 02 springs and cam below some rev limit. Just as obviously, the lighter valves will safely rev higher. You need to know where valve float starts to be a problem if you don’t have the lighter valves.

<small>[ March 25, 2003, 08:37 PM: Message edited by: Gary Z ]</small>

Cliff98Z

I get ya Gary, but I hope I could move the rev-limiter up to 6500 or 6600 or it probably wouldn't be worth the swap.

Gary Z

I'm often wrong, but I doubt that GM would have gone to the trouble and expense of developing the lighter valves if the LS1 valves would safely run to 6600 rpm.

pekkaz

GM did it because they want the majority of the stock Z06s survive well past 100k miles without valvetrain problems.

I would guess most of the cars would have survived 10k miles with a little heavier valves.