Zero4488

iTrader: (10)

Like the title says. How can I tell the difference between the sodium valves and the standard ones? I recently picked up a set of heads and the seller didn't know which they were. They are 243's with yellow springs. Do the valves themselves look different? Hopefully someone can fill me in....

-Dave

wildcamaro

iTrader: (15)

You have to weight the valves themselves, that's the only way I know...I believe the intake valves are 100g for ls2 and 66g for the hollow ls6 ones...

PREDATOR-Z

LS6 valves are longer.

Zero4488

iTrader: (10)

So you really can't tell unless you disassemble? No visual tells?

slinginrods

I don't understand why you say this.a longer valve would require a different spring to achieve the same seat pressure.longer would be less,shorter would be more assuming the shims were the same thickness.and I've not seen any differences in spring seats between the two.also if it were longer above the keeper it would throw the valve train geometry off.have you ever actually measured the two? Or is this more Internet "facts"? I'm curious because I'm using the ls6 springs in my 5.3 heads.do you know what the installed height is supposed to be?The only other thing could be a cam with a different base circle,then it would make sense to get the proper preload on the lifter.

slinginrods

http://www.c5registry.com/2k2z06/page4.htm

96capricemgr

iTrader: (1)

I haven't had the heads off an LS yet so I am just throwing an idea out there.
On my LT1 stuff the intake valves are magnetic, the exhaust valves not.
Would it be possible the solid intake valves would be a magnetic alloy but the hollow ones not?

I was mostly just trying to think of a non-visual way that could possibly work, maybe the LS valves are all non-magnetic or something, I do not know. I will be honest and say I don't feel like pulling a valvecover off my truck to check an 05 5.3l either.

slinginrods

On the gen 1 sbc ,sodium filled valves were non magnetic,I assume the same on ls series but have not confirmed it.