Yella Terra Rockers!!
Thread Starter
11 Second Club
iTrader: (19)
Joined: May 2006
Posts: 965
Likes: 0
From: Whidbey Island, Wa.
Well I bought and paid for a set, so hopefully they work out.
I was also thinking about takeing some material off of them and see how they work. I have the equipment to do this, so I would like ot see what the outcome would be. Experiment alittle. And then give you guys a good breakdown, on what I will do to the rockers to make them lighter, But I am going to have to wait until I recieve them that way I can make a good judgment on where to take material off at.
Lane
I was also thinking about takeing some material off of them and see how they work. I have the equipment to do this, so I would like ot see what the outcome would be. Experiment alittle. And then give you guys a good breakdown, on what I will do to the rockers to make them lighter, But I am going to have to wait until I recieve them that way I can make a good judgment on where to take material off at.
Lane
Staging Lane
Joined: Oct 2006
Posts: 72
Likes: 0
From: Hobbs, NM
I wouldn't remove any material. I am sure that if YT could have made them lighter without causing any reliability issues, they would have. If you grind on them, you could cause places where stress cracks could start which could cause parts failure, and then who knows where all the pieces end up in your engine. You are worrying to much about this, just put them on and go have some fun. Trust me, they look great when you get them and have to be a ton stronger than the stockers.
Thread Starter
11 Second Club
iTrader: (19)
Joined: May 2006
Posts: 965
Likes: 0
From: Whidbey Island, Wa.
allright, Sounds good,
My plan was not to grind on them, but to mill on them, I was actually thinking about puting them in my CNC, and using a ball endmill, and shaving some off. But thats why this site is here, for your guys opionions. Thanks
lane
My plan was not to grind on them, but to mill on them, I was actually thinking about puting them in my CNC, and using a ball endmill, and shaving some off. But thats why this site is here, for your guys opionions. Thanks
lane
Weight is a poor measure of how rockers will affect the valve train performance. Rotary inertia is what you need to evaluate with weight over the nose being an indicator but not the final answer as rocker stiffness will also play a role in performance as well. An aftermarket rocker could weigh more than stock but the increase may be due to bigger bearings which have little affect on the inertia of the rocker. Removing material without understanding the stress field is a recipe for disaster and I always get a chuckle out of the LS1 Performance book where they ground the rockers in the worst possible location to clear some valve springs in one of their example installations, wonder how long those will last.
I just put these on the other day. So far I love them. They quieted the valvetrain down immensely, which is what I was after. If they add power that is a plus but I really don't care. I was looking for quiet and got it 
I have some of the new-style Ultra Light Yella Terras sitting in a box. I hope to install them in a few weeks.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
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2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
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Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by Patrick G
I have some of the new-style Ultra Light Yella Terras sitting in a box. I hope to install them in a few weeks.
Originally Posted by PREDATOR-Z
What other cam combo are you cooking Patrick? You wouldn't be going solid roller by any chance
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by Patrick G
Not solid roller Mark, but I am going to turn the power notch up a bit (with stock cubes).
I have something in mind to do over the Summer (since it is too hot to race), I think i'm gonna test one of these "reverse" that I had discussed in a previous thread.
I also run the old style since 03 with Patriot Duals. Shifts for max power are 6500rpms, rev is at 6800. No tell tale signs of valve float. People that have had problems with float where running springs on the edge of being able to control the cam specs. If you run the correct spring pressures for your cam there should be no problem.
I've ran the old style YT's since they first came out with no problems. They are being used with comp 977 dual springs. I go through the traps @ 7400 rpms with no float problems at all.
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Last edited by studderin; Mar 17, 2007 at 12:53 PM.
Originally Posted by New Era Performance
The new ones are ball milled across the top from the trunion to the tip for weight reduction on the end of the rocker (around 5 ounces lighter) .
Has anyone done a before and after on these rockers (the new ones), I read on another board from a vendor that they lost power with these when they put them on. They were also selling a different brand so I am trying to gauge how good that information is. Just a point of curiousity for me as they are a very nice looking setup.
Originally Posted by vettenuts
Has anyone done a before and after on these rockers (the new ones), I read on another board from a vendor that they lost power with these when they put them on. They were also selling a different brand so I am trying to gauge how good that information is. Just a point of curiousity for me as they are a very nice looking setup.
https://ls1tech.com/forums/generation-iii-internal-engine/454815-yella-terra-redesign.html