Spaceme1117

I am sure that this has been answered before and I tried the search but not finding the answers I need.

I am thinking of getting a set of 1.8 ratio rockers, 1219X PAC springs, BTR titanium retainers and hardened pushrods for a little power bump and valvetrain upgrade and I have questions. This is for a 2011 GS with LS3.

1. Was thinking of getting the 1.8 Yella Terra's. Are these the best?
2. Will they fit under the stock valve covers without clearance issues?
3. Stock length pushrod correct for this, 7.400? Or do I need longer? (I will measure regardless)
4. Anything else I need to know?

I will have my tune adjusted to take advantage of the mod. I probably won't change out the valve seals as the car only has 20K miles on it.

Thanks.

veneno

I am using the 1.85 yella terra rockers. I did not change the valve springs didn't have any issues for 10k miles.
I did change the push rods for longer 7.45 and the kit came with valve cover spacers. That along with
ported stock intake and throttle body I notice it pull harder. Someone on the camaro5 forum is selling his
package deal for good price imo

Spaceme1117

Thanks for the heads up. I have made a deal for the package.

Unreal

Yellaterra rockers are not really looked well upon by most people. The have several issues, and you couldn't pay me to run them. If the offer was $500 to me, and the rockers I would still say no. I wouldn't even take them to resell them because I would feel bad about selling them to someone else.

1219 are a pretty stout spring, and those rockers, and possible the lifters won't like that much pressure.

SacCityCorvette

We have been running Yellaterras on our LS7 heads with a .651 lift and the springs to match the setup for quite a while now. The only problem was the needle bearings pitted the shafts and didn't hold up.
So we got new shafts and made bronze bushings with special oiling grooves. They have been working great! We recently checked to see how our bushings were waring and they are holding up perfectly.
This engine sees 7000 rpm pretty often.

Thanks
Christian

Vette Threat

I've been running the 1.85 Yella Terras for 5 years now and about 50,000kms on stock GS heads and springs with ARP studs, comp cams push rods, Z06 exhaust and the Haltech air intake, ECS mail order tune. Feels frickn' AMAZING!

Vette Threat

Yella Terra 1.85

veneno

mine felt strong with the boltons and 1.85 rockers but now I just installed texas speed cnc/ported ls3 heads and custom cam to go with the yella terra 1.85 rockers it pulls like a ****
Also installed 25% underdrive pulley and mail order tune from tampa tuning

Spaceme1117

Interesting. Do you remember what length pushrod you needed to use with the rockers? And did you need to use the shims under the pedastals?

I was able to purchase the 1.85 rockers, 7.450 pushrods, PSI 1511 behive springs, and titanium retainers from a person on the Camaro5 forums. Should be everything that I need to do the installation correctly.

Vette Threat

There were no shims needed except for the valve covers which came with the rockers. Yes, I used 7.450 pushrods at they fit perfectly.

lazerlemonta

I had mine on for some time on my 1LE and then swapped them to my C6. I managed to run 10.58@131 with bolt ons and the rockers and made 453/445 SAE. It is a great upgrade however I do not suggest using stock springs. One your well above the max lift and close to coil bind and 2 you can drop a pound out of the valvetrain by using a psi1511/1516. I had a BTR titanium retainer fail recently but this was after a lot of abuse and 50k miles. I ended up doing GPI 281cc heads and SS4 cam and put down 562/448 SAE over the weekend.

Corvalex

What happened to the BTR titanium retainers??

lazerlemonta

it wore the rim thin and went inside the spring. I had three others that were also showing fatigue. Not the retainers fault at all. They should have been changed at 30k miles likely.

Corvalex

Thanks for the info. I hoped the ti-retainers would be a bit more stable... So maybe its better to use the heavier oem-retainers in combination with high-lift and strong valvesprings?

lazerlemonta

tool steel would be my vote for low maintenance street car.

veneno

when I sent my heads to get ported I had them install Howards 98112-K1 Beehive spring kit good for .640" lift

Spaceme1117

I did a little bit of research and seems that the Ti retainers do wear out faster as they are a softer metal versus the steel spring and are only really necessary if you will be spinning the motor higher.

I decided that I will just re-use my stock steel retainers.

PRE-Z06

Impressive numbers all around! What ET are you shooting for with the new combo? Also curious your opinion of 60’ with a super light clutch that doesn’t have a lot of MOI? My experience when I worked at Monster and testing a 22lb setup was it took more rpms which meant more heat having to be generated and didn’t bode well for a small clutch that didn’t have a lot of thermal capacity. FWIW I went 1.49 (10.9@125) with 422rwhp and 42lb Kevlar clutch in C5, went 1.54 with stock LS6 clutch at 393rwhp and 1.61 with stock LS2/3/7 clutch in bone stock Grand Sport.

lazerlemonta

Heading to MIR Monday to see. Looking for 9.99 out the fast intake and 9.8x with the LOD intake. I managed 1.50 60' with the 16 pound tilton but i welded the discs together by the end of the day lol I now have a Twin carbon RPS with aluminum flywheel that weighs a hefty 26 pounds. It has netted me a 1.52 60' last fall on a not so great day. Looking for 1.4s Monday and some 137-138 trap speeds I went a best of 132 with my bolt on set up last april.

PRE-Z06

I figured it’d go 9s and trap 140+ with the additional power, Godspeed and looking forward to your results! I I orginally had the LS6 clutch on a fidanza Aluminum flywheel and it only cut 1.6s launching at the same rpm for comparison, had to launch higher to cut the same 60’ than with heavier steel flywheel and it eventually had disengagement issues as it warped the steel insert from the additional heat created by more rpms. Imagine yours revved similarly...

Sorry for the hi-Jack op as I know your post wasn’t about clutches.