1.9 modified vs. 1.95 roller rockers

[Silver GTP]

I tried searching and couldn't find what I was looking for. I was ready to order the Yella Terra 1.95 rockers and then read a post recommending 1.9 modified rockers. Which one is better with a 3.4 setup and why? I was going under the assumption that the 1.95's were the better option but thought I would put the question out and see what people had to say. Thanks.

[matt5112]

1.95's give you more lift, and since they're roller rockers theres less stress on your valvetrain. Something you might wanna minimize considering you're going to be asking the valves to open up quite a bit more.

[AmericanSoldier]

http://www.grandprixforums.net/f18/1...9-a-30113.html

[Silver GTP]

Thanks AmericanSoldier. I'm on my phone right now and it was really slowing the search down. I guess I should have been more patient and waited until I was at my comp. Maybe I would have found that.

[AmericanSoldier]

no worries..that thread helped guide me in which rocker direction i wanted to go in..if i didnt get my yella terras cheap from a member iwould have gone with the modified due to price..let us know how it goes bud

[blueguy]

And don't skimp...get stronger valve springs too...and get the car tuned afterwards...only way to fully benefit from them.

[Silver GTP]

And don't skimp...get stronger valve springs too...and get the car tuned afterwards...only way to fully benefit from them.

Thanks for the extra advice to make sure I do it right. I'm planning on Crow 105's to go with them based on all the posts I've read here about them. I'll get the tune done when I drop to a 3.4. Hopefully, all my mods will be done by the end of summer.

My car has 64,000 miles on it. How long should the timing chain last with the 105# springs?

[2003 SSEi]

i would NOT do the 105 springs.

the general consensus is to go with the GM L76 (G8 GT) springs. They are the replacement for the LS6 spring

[Silver GTP]

Hmmmm..... I guess I need to do more reading on this issue. I thought the 105's put the least stress on the stock timing chain and was the way to go. Can you help to educate me on this issue? Why are these springs better and what are the pros/cons of them? Thanks.

[Scimmia]

There's nothing wrong with the Crow 105s. It's the Comp Cams 105s that you need to stay away from.

The L76 springs are good for low lift applications like this. 90 lb seat pressure, but stock spring rates instead of the high spring rate used on the LS6 springs. They will put no more stress on the timing chain than the 105s and they're cheaper. They do have less seat pressure, though.

[blueguy]

i would NOT do the 105 springs.

the general consensus is to go with the GM L76 (G8 GT) springs. They are the replacement for the LS6 spring

Still, Like stated below...its the Comp 105's that break, not the Crow springs.

There's nothing wrong with the Crow 105s. It's the Comp Cams 105s that you need to stay away from.

The L76 springs are good for low lift applications like this. 90 lb seat pressure, but stock spring rates instead of the high spring rate used on the LS6 springs. They will put no more stress on the timing chain than the 105s and they're cheaper. They do have less seat pressure, though.

I did however use the LS6 springs/retainers when I did my XP...can't say I had any issues with them but that's just me. They are cheap though.

[Silver GTP]

After doing more searching and seeing your responses, it looks like the L76 springs are the way to go. The price is definitely nice too. Only $2.22 each on gmpartsdirect. I know I need the retainers, but what about the valve locks? Are they the same on the G8 and GP? They are cheap so I'm going to replace them and the valve seals while I'm there.

To summarize, I need 1.95 Yella Terra rockers, L76 springs and retainers, L67 valve locks and L67 viton valve seals, correct?

Thanks very much for the help guys!

[matt5112]

Just be sure to check your tensioner.

If that nukes, it'll take out your chain.

[blueguy]

Well, checking the dampner requires removing the front cover...so he might as well cam it if he is in there IMO.

Also, I'd get Comp Cams locks. You can get them from Intense cheap IIRC...along with the Viton seals. If you don't even plan on going cammed though...your doing the right thing...top of the line rockers with the highest ratio. Be sure to get it tuned afterwards though, to take full advantage of them. Rev it up a bit...those springs will allow it too

[Scimmia]

The locks are the same, just reuse them. Assuming you don't drop any, of course.

[blueguy]

I just figured since they aren't THAT much that it wouldn't hurt putting new ones in. Comp or stock...I'd just do it since your there.

[Scimmia]

Yeah, nothing wrong with replacing them. Either way, they're the same so you can get locks for whatever engine.

[Ibwrong]

but once again if your going to dig into the cover to replace your tensioner or chain you might as well cam that thing.

[blueguy]

Then he'd be wasting the money he spent on rockers.

[Ibwrong]

Just saying... he could always resell them for close to what he paid.I understand that a cam is not for everyone.

Keep us updated on the install..