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Mar 21, 2011 | 12:35 PM

blakss

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From: Chicago Il

Heads Question.

Over the weekend I had a chance to visit one of our sponsered vendors and talked to them for a bit they told me since we have 243 head we have complete Z06 head wit sodium filled and hollow valves and yellow springs? As far as I knew they were regular valves and ls1 springs, nothing to special. Any body got any info on this?

Mar 21, 2011 | 12:47 PM

SidewaysV8

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This doesn't answer your question, and they don't show the RPO for the LS4 but thought you may get something out of it.

http://www.carcraft.com/techarticles...ads/index.html

Mar 21, 2011 | 01:06 PM

DavidGXP

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243 casting with LS6 blue springs and std. valves.
Yes we have the big valves.

Mar 21, 2011 | 02:23 PM

blakss

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If we already have LS6 spring why are people swaping to the yellow springs? Are the standard valve sodium filled & hollow or jus stainless steel? Thanks for the info yu guys

Mar 21, 2011 | 02:39 PM

DavidGXP

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Quote:

Originally Posted by blakss

If we already have LS6 spring why are people swaping to the yellow springs? Are the standard valve sodium filled & hollow or jus stainless steel? Thanks for the info yu guys

LS6 blue's are good for .500 lift and yellow's are good for .550 lift.
(or so, some say) I think the blues were used on LS1's too.

We just have the plain jane valves. Nothing fancy.
They are not sodium filled and they are not SS. Wishfull thinking.. lol