Installed LS6/LS2 valve springs on '01+ 3400

[AaronGTR]

your probably not reaching any valve float right now, but for the 02 heads you may be the different valve guides, same as the 3.1's.. I'm not sure on that one.

Yes, the '02 engine definitely has the larger valve guides. It started in late '00.

He may actually be getting some valve float too. Most grand ams I've seen dyno'd power falls off 400-500rpm before the stock redline, and since he has a DHP pcm his redline is higher than stock. I got it on good confidence from a certain GM engineer we talked to at one of the grand am picnics in lansing that the stock LA1 valve springs were known to start having valve float issues before the stock redline after they get some miles on them. Probably why they upped the spring rate on the 3500, and the reason many of us started swapping in LS1 springs for stock cammed cars to begin with.

[Guest]

Wahtever you do, don't listen to aaron. He isn't the brightest crayon in the box

[SappySE107]

That got you a week. I hope it was worth it.

[gectek]

the good ben giveth and the good ben taketh away

[3400-95-Modified]

Hey Ben... off topic but did you ship my cam, and did that broze gear come in yet to test?

[Rhedalert]

the good ben giveth and the good ben taketh away

[gectek]

ok so on the LS6 springs, when u use the 2.2L valve seals, do you use the intake seals or the exhaust seals, or can u use both, use intake on intake, or what??? a little comfused

[Syn]

exhaust

[Superdave]

exhaust

x2

i have them on a set of '04 heads right next to me.

'91 2.2L exhaust seals.

[kprofthestrs]

with all the talk about the 3400 head and using the ls2/6 springs. what about the 3500 heads the ones based for the 3400 block not the 3900/3500?

probobly gonna swap a 3500 top end and curious to know if the spring swap is needed on the 3500 heads

[AaronGTR]

with all the talk about the 3400 head and using the ls2/6 springs. what about the 3500 heads the ones based for the 3400 block not the 3900/3500?

probobly gonna swap a 3500 top end and curious to know if the spring swap is needed on the 3500 heads

The spring swap is only needed if switching to a bigger cam, doesn't matter which set of heads it is. The 3500 springs are stiffer than 3400 springs but still not stiff enough for a high lift high duration cam.

[kprofthestrs]

would changing the springs now before i install the heads onto the vehicle be
more benaficial for higher rpms. i bracket race this vehicle and with the 3500 topend swap i will be adding a 35 shot of nitrous.

[ForcedFirebird]

With a Gen12 3.1 I acn use the LS2 springs with Toyota seats, ground LS2 shims and my stock seals?
I just discovered (I think, untill I pull the covers) that I broke a spring, which I already knew I was dangerously close to binding the stock exhaust springs with the 1.7RR's and ran them anyways (my own fault). So I'm thinking now of going with a turbo (Delta re-grind) cam, 1.6RR's (already have a set of Crane magnums) and the LS2 springs to help ease the stress a little.

[kprofthestrs]

these parts will actually be applied to a 2000 3400 engine. just curious since im gonna have the 3500 parts if doing the springs before i install all the parts is really gonna be benafical since i will be using chrome moly rods also.

[gectek]

ok in case yall want to know, comp makes a spring seat/spring shim (.060 IIRC) that will work with no probs they are pn 4705-12, but for some reason they arent on the comp site, thats ok, you can find them here and get them even cheaper than the comp website, go to www.sdpc2000.com and enter the pn and thats it, about 32 bucks, not too bad, ill post pics in a new thread when i get the chance