View Full Version : Do I need to do anything to put Z06 valves in stock LS1 heads?


Skinny
08-13-2004, 12:32 AM
I have a valve that decided to shake hands with a piston, and I have access to a set of lighter Z06 valves. Are they the same size as stock LS1 (99) valves? Does any modification need to be done to the head for them?

Jason99T/A
08-13-2004, 12:48 AM
The LS6 valves will drop right in. Just be sure to lap the new valves in and you will be good to go. If possible, find a machine shop with LS1 experience to perform a "quality" valvejob while the heads are down.

Jason

Skinny
08-13-2004, 06:33 AM
Thanks Jason! :)

mooleyz28
08-13-2004, 10:16 AM
It is a LONG process so take it somewhere familar with ls1's and let them do the job right and get that stress off u. But no modifications needed. I read that those valves are a million times better than stockers. good choice!

IslandTahoe
08-14-2004, 04:02 AM
Diameter may be the same, but I thought that the valve stem length is longer for the sodium filled LS6 valve than the LS1 version. Something about the LS6 cam having a smaller base circle and the longer valve stem is part of the geometry solution.

Does this sound familiar to anyone?

o2haWK
08-14-2004, 04:20 AM
Diameter may be the same, but I thought that the valve stem length is longer for the sodium filled LS6 valve than the LS1 version. Something about the LS6 cam having a smaller base circle and the longer valve stem is part of the geometry solution.

Does this sound familiar to anyone?
Yes you are right!!!

Skinny
08-14-2004, 03:30 PM
How much longer are we talking about here? Does anything else need to be corrected for this?

kossuth
08-14-2004, 10:46 PM
You might need shorter pushrods to get it all back into whack. Just depends how much longer the valve stem is that stock. Might need to go with a 7.35 or a 7.30 just depends I guess. Unfortunately I don't know never done that swap before.

fastsspr
08-15-2004, 02:48 AM
that mean that the LS6 motors came from factory with a different pushrod than the LS1?

RedHardSupra
08-15-2004, 11:37 AM
So if I have a z06 cam and 7.4 pushrods and want to put in LS6 valves, would it make it better or worse?

PREDATOR-Z
08-15-2004, 11:58 AM
1-You will need shorter pushrods if you use LS6 valves in an LS1 on a LS1 cam.(7.35)
2-The LS6 cam has smaller B-circles, that is why they made the LS6 valves longer, (7.40 it is)
3-And to confuse the shit out of everyone: With a LS6 cam in an LS1 with LS1 valves, you'll need longer p-rods

LS1derfull
08-15-2004, 12:14 PM
1-You will need shorter pushrods if you use LS6 valves in an LS1 on a LS1 cam.(7.35)
2-The LS6 cam has smaller B-circles, that is why they made the LS6 valves longer, (7.40 it is)
3-And to confuse the shit out of everyone: With a LS6 cam in an LS1 with LS1 valves, you'll need longer p-rods

You are correct, about this but i want people on here to know that i succesfully run around half the normal lifter preload and my motor rpms cleanly to 7k with no negative effects. I have slightly more valvetrain noise but much less chance of ptv interference from lifter pump up.I run 918 springs for 2 years with well over a 100 track passes, no problem daily driver.

IslandTahoe
08-16-2004, 04:35 PM
Ok here is some reference material:
"The valves in the 02 LS6 are 0.6-mm longer than the valves in all other Gen III Engines."

Very interesting article about 02 LS6 Changes
http://www.idavette.net/hib/02ls6/page2.htm

RedHardSupra
08-16-2004, 05:47 PM
1-You will need shorter pushrods if you use LS6 valves in an LS1 on a LS1 cam.(7.35)
2-The LS6 cam has smaller B-circles, that is why they made the LS6 valves longer, (7.40 it is)
3-And to confuse the shit out of everyone: With a LS6 cam in an LS1 with LS1 valves, you'll need longer p-rods

umm...so is LS6 cam, LS6 valves and 7.4 pushrods the right combination in LS1 block?

02RedHawk
08-16-2004, 08:59 PM
umm...so is LS6 cam, LS6 valves and 7.4 pushrods the right combination in LS1 block?

Yes....

PREDATOR-Z
08-17-2004, 04:41 AM
:nod: :nod: :nod:

One of them at least

All three combos that I mentionned will work fine. Take your pick.

RedHardSupra
08-17-2004, 09:34 AM
For right now i got a ls1 block, z06 cam, 7.4 pushrods, and HS 1.8 rockers. I got a great deal on LS6 valves, so I've been thinking of putting them in. Is there anything wrong with my current situation?
What's the math/logic that you figure this stuff out? Isn't it as simple as cam pushing the pushrod, which pushes the rocker, which moves the valve? Wouldn't the length of the pushrod and a valve stem be dependent also on the rocker ratio a bit? How much space do I have to work with? what are we worrying about, valves going too far and hitting pistons or something else? I am a mechanical moron so feel free to set me straight here.

RedHardSupra
11-29-2004, 10:12 AM
I still would like an answer, anyone?

GrannySShifting
11-29-2004, 12:05 PM
Hey LS1wonderfull hit me a PM. Ever had any problem running 1/3 turn preload? What do you run