I am getting LS1 GTP S1 heads and they have stock valves. Would replacing the valves with LS6 valves have any positive or negative effects? Are the valves interchangeable? Thanks

Cajun

 

the ls6 valves are lighter therefore will move faster and not work the springs as much. It would be a smart upgrade. All positive affects and no negative.

 

LS6 valves are lighter being hollow but they are a fraction longer. May be worth checking rocker action once it's assembled. I'm going to use them

 

I guess I will go ahead and use them. The guy that sold me the heads sent them to me free so why not? Thanks

Cajun

 

The LS6 are hollow sodium filled valves that are considerably lighter. This allows you engine to rev more freely, and rev higher, with much less possibility of valve float. A good set of springs, LS6 valves, titanium retainers, and some lightweight rockers would make an excellent valvetrain....hmmm.

 

I have Manley doubles, Ti rets, seats, locks, LS6 valves

Where do I get lightweight rockers? What rockers do I need for Comp 224 .563 114 LSA with GTP S1 heads? Thanks

 

Well you should definitely run the stock ratio (1.7:1) with that lift. And the better ones are shaft mounted and aluminum. So maybe the Comp Cams 5054170s? I haven't replaced mine, but those are the things to look for, and Comp Cams makes good parts.

 

GM Stock LS1/LS6 ret 11.3g
GM 03' Z06 Spring 77.3g
GM Stock locks 2.5g
GM Stock int valve 2 101.1g
GM Z06 Int valve 2 74.7g
GM Stock exh valve 87.3
GM Z06 Exh valve 1.55 64.6

As you can see, stock LS1 valvetrain is 1688g (if my calculations are right)
LS6 valvetrain weight is 1295g.
That is a 23% drop it weight. Should be significant, but I've never seen a dyno comparison of ls1 vs ls6 valves swap :/

 

Cajun,
Dont worry about replacing your rockers, the stockers are pretty darn good and up to the task. As said above the LS6 valves are sodium filled and quite a bit lighter -> less stress on the valvetrain. Check a little deeper on the valves though, i know they are a little longer which should not cause an issue, but I could have sworn they were a different shape as well. Try a search on this site and re-post this topic asking about the shape/compatibility of the LS6 valve with an LS1 head.

-Nick

 

It's only the exhausts that are sodium filled. The inlets are empty and if you drop one it will bend, I dropped one and had to import a single valve!

 

Interesting info.

 

So what is the bottom line here?

Use or do not use the LS6 valves?

My buddy told me that they are longer and may not work well?

Again I thank you ALL for the help!!!!!!!!!!!!!

 

I obtained a set of LS6 valves, can they be a 'drop in' replacement for the LS1 valves, or do other parts need to be changed (ie: pushrod length)