LS9 sodium filled 1.59" exhaust valves into LS3/L92 heads

[Gelf VXR]

What's involved, they are the same height valve, however require lower height retainer locks that require LS9 only retainers and LS9 only springs stock or custom. Advantages bit lighter better heat dispersal. Installed height 1.78 vs 1.8

Would mean different valve train components on exhaust side if used with LS3 hollow inlet valves?

[Gelf VXR]

I guess if you want the sodium filled exhaust valves you have to get the titanium inlets too

https://chevroletperformanceparts.com/p/ls9-valvet... 860US$

Double spring kit from BTR 309US$

http://www.briantooleyracing.com/660-lift-platinum...

I doubt normally aspirated will have the issues the LS7 / LS9 have had witth worn valve guides, but you would need LS9 valve guides also all the same?

Edited by Gelf VXR on Saturday 1st August 02:06

[stevieturbo]

I would be surprised if they are lighter than aftermarket 1 piece valves, which would probably be cheaper ?

[Boosted LS1]

The ls7 valves feel incredibly light Stevie but I haven't got the weights to hand. Doubt they'll be very different to the ls9 weights.

Edited by Boosted LS1 on Saturday 1st August 08:56

[Gelf VXR]

Here are some weights I've seen online,

LS7 titanium inlet valve 77g

LS7 exhaust valve - 72~74g
LS7 REV exhaust valve - 98g
LS7 titanium exhaust valve - 66g

LS9 titanium inlet valve - <77g
LS9 hollow sodium filled valve - <74g

LS3 hollow stem inlet valve - 89~91g

L92 inlet valve - 106~109g

LS3/L92 exhaust valve 90g

Manley 11620 solid inlet valve - 119g
Manley 11621 solid exhaust valve - 92g

When fitting new valves, should you lap them, re cut the seats, just drop them in? I've seen conflicting views online!

[MyM8V8]

Gelf VXR said:

Here are some weights I've seen online,

LS7 titanium inlet valve 77g

LS7 exhaust valve - 72~74g
LS7 REV exhaust valve - 98g
LS7 titanium exhaust valve - 66g

LS9 titanium inlet valve - <77g
LS9 hollow sodium filled valve - <74g

LS3 hollow stem inlet valve - 89~91g

L92 inlet valve - 106~109g

LS3/L92 exhaust valve 90g

Manley 11620 solid inlet valve - 119g
Manley 11621 solid exhaust valve - 92g

When fitting new valves, should you lap them, re cut the seats, just drop them in? I've seen conflicting views online!

What kind of prices are you talking about Andy?

[Boosted LS1]

I once tried to lap in some ls7 valves but it didn't seem to make any impression on the seats. Probably because of the materials being used. I think normal valves would benefit from lapping but you do hear that with new stuff some people don't bother.

[Gelf VXR]

I'm just pondering the sodium filled exhaust valves US$26.55 each

http://www.gmpartsdirect.com/results.cfm?singlepar...

Double spring kit from BTR 309US$

http://www.briantooleyracing.com/660-lift-platinum...


About 525US$ plus shipping and import duty

[MyM8V8]

What's the rationale for all of this Andy?

Are you just doing exhaust or both.

BTW BTR are $25 each.

[Gelf VXR]

MyM8V8 said:

What's the rationale for all of this Andy?

Are you just doing exhaust or both.

BTW BTR are $25 each.

I still have spec'd cam ~.631 lift, and LS3 hollow stems waiting to fit when I eventually get home, maybe next year, just something while the heads are off, I have a collection of parts mounting up. If I buy the parts now, the wife wont notice lol