blakss

iTrader: (4)

Looking to run this setup and need some input. Have been hearing horrible things so kinda having second thoughts.

Old SStroker

Stock LS7 intakes are Ti. Quite a few folks inside and outside of GM consider that a DD engine. Pretty good powertrain warranty also.

If you are building a DD, why the Ti valves?

blakss

iTrader: (4)

Jus looking to free up some weight and speed up the revs. And well got a good deal on the set so was trying to have them put in while I was having the head work done but the people who are doing the head work are telling me its not worth it because I need copper valve guides and copper beryilium seats and to get them install and everything its gunna get expensive . And that I was better off with LS3 valves .

Old SStroker

Before I made a decision I would look at OEM LS7 heads for valveguide and valve seat material.

Your head shop probably meant bronze guides. How many Ti valved LS heads have they done?

Not sure what you mean by "speed up the revs". Lighter valves, when combined with the correct valvetrain parts will allow higher maximum rpm while maintaining valvetrain control, but they really don't help the engine accelerate faster.

Check the weight of a Ti intake vs. an OEM LS3 (hollow) vs. an L92 truck intake. Ti is definitely lighter, but unless you engine is pulling well above 7000 there are better things to do with your money.

Some head shops are just that...they are not valvetrain experts. Evidence of that is some of the valve, spring and retainer combinations they put on their heads.

Good valvetrain design should be part of your engine's plan. Sadly, many times it is not.

Jon

Stage7

iTrader: (1)

This separates the men from the boys.

Stage7

iTrader: (1)

OP: You should get the Ti valves coated if they are not already. Otherwise they will not last long on the street.

Fb0dy0nly

iTrader: (10)

Im pretty sure that GM designed the ls7 to be driven on the street...
or do you know something we dont..


OP, what RPM do you plan on spinning to?

blakss

iTrader: (4)

Stage7- Yea they are already coated. But working on having them trimmed down and recoated, heard they should be fine with the coating on the street.

Stage7

iTrader: (1)

I'm not sure what I wrote to lead you to think I said anything about the ls7 not being intended for the street? I never mentioned the ls7 until now.

Of course GM intends the ls7 to be a street motor. That's why they coat the titanium valves in the ls7 heads.

blakss

iTrader: (4)

Fbody- Yea that's what I'm saying ,everyone is saying you need CuBe seats and bronze valve guides to make this even remotely possible. And I'm not trying to go that high if anything right around 6500 .

blakss

iTrader: (4)

SStroker- Yea your right kinda hard making decisions because I'm not to familiar with the LS7 heads at all and from all the research that I've done looks like they ran titanium valves with regular plain jane seats. So from what I see I should be fine but every one else(the shops that I called) call me a witch! Lol they say that that's not gunna work without bronze valve guides and CuBe seats , Sorry I was in a rush before and wrote copper.

But either way the shop I called says I'm better off running the LS3 valves, never even looked at the L92 valves, but know the valves I got weigh 71 grams idk how the compare to the rest. And true about the valvetrain combos. Most people lead me in the Dual spring combos which I wasn't a fan of but I think I'm gunna give it a try. And as for the decision, I got a good deal on the valves so figured I'd see if I could work with it or if not go a different route.

1lejohn

iTrader: (9)

What Jon said. I looked into runnning Ti valves but they have issues with parts compatability. I went with the REV valves for an LS3 they are a better part for the money. Imop. Check and see if they have aset for the 243 heads.

miami993c297

iTrader: (6)

Hello Jon,

Have you expressly omitted to mention the rockers, the pushrods, the lifters, and the lobe design when you write about valvetrain expert?

Christian

Old SStroker

Christian,

My "correct valvetrain parts" comment broadly hinted at this. You are most correct: valvetrain stability starts with the lobe design and includes all of the bits. One weak link in the valvetrain chain will "screw the pooch". Too many valvetrains have more than one weak link.

I believe you have experienced valvetrain woes that were corrected when the correct parts were used.

Regards,

Jon

miami993c297

iTrader: (6)

You are correct Jon and thank you for your help and guidance to help the resolution of my engine problems.

I didn't know you could replace "costly nightmares" by "woes"!!!

Christian