Roller rockers on Ls1
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 984
Likes: 23
From: Florence SC
Roller rockers on Ls1
I want a set of roller rockers! I'm asking for advise on which set to get. I don't really know what cam is in the motor other than its a comp. and I don't want to get into machining or spaced valve covers. I can do what is necessary concerning push rods though. Thanks for your suggestions.
Last edited by bracketshark; Apr 17, 2011 at 09:48 PM.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I have been happy with my Yella Terra rockers. Only warning though, to correctly shim and set up you may need to clearance the valve covers of any rockers you buy. Also, LS1howto is wrong on setting these up so don't follow it. You need to shim for wipe first, then measure for pushrod length. These rockers can be set up with a very narrow centered pattern if you take the time to do it correctly. That is their main advantage over stock, not a hp gain. If you are buying for a hp gain, you are wasting money.
Racer
Joined: Aug 2005
Posts: 465
Likes: 16
I installed a set of Yella Terra Ultra Lts on my Z06 recently. I had to remove the baffle on the d/s valve cover as they were hitting it. Using the provided shim on my oem 243 heads & the wipe pattern was good to go but that doesn't necessarily mean all are the same.
In all honesty, my car has had a .600+ lift cam in it for 50K miles on the stockers and I didn't see any unusual wear on the rockers or valves. But if you want full rollers, the YT Ultras are a solid choice.
In all honesty, my car has had a .600+ lift cam in it for 50K miles on the stockers and I didn't see any unusual wear on the rockers or valves. But if you want full rollers, the YT Ultras are a solid choice.
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
SLP 1.85 rockers are the stock rockers set up to 1.85 and then trunion modified by Comp. Only problem is that they're way overpriced at about $600 a set. One set that I find interesting (I've been researching rockers also) is the Comp Ultra Gold 1.82 aluminum rockers. They seem to be the only ones, in my searching anyway, that haven't had any issues like cracking, spitting bearings, etc. However, as mentioned you will not get big power from rockers, though, in my searching, those in the 1.8-1.85 area appear to boost the top end by 12-15hp but are most advantageous in boosting power "under the curve". In other words, power and torque seem to improve all the way through, but not tremendously. In addition, you better find out what cam you have so you're not busting springs or bouncing a valve off a piston. I do not claim to know a whole lot here as I'm still in the investigative phase, and it seems very difficult to find someone who dynoed before and after a rocker installation and tune. Everyone seems to have added other components, also. Very difficult to quantify effect of a single component that way. 
Ed
Ed
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
Ed
Last edited by C5XTASY; Apr 17, 2011 at 09:40 PM.
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 984
Likes: 23
From: Florence SC
How about the Scorpions advertised on the forum? They advertise no machining, lifetime warranty, using the stock push rods, with the stock valve covers. I'm also having trouble convincing myself that push rod length doesn't affect roller position on the valve stem. I'm not calling BS I just can't get it straight in my head. Check these out.
http://forums.corvetteforum.com/c5-t...3-and-ls9.html
http://forums.corvetteforum.com/c5-t...3-and-ls9.html
Last edited by bracketshark; Apr 17, 2011 at 09:59 PM.
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Safety Car
Joined: Jul 2004
Posts: 3,904
Likes: 29
From: Vancouver Washington
I ran Yella Terra 1.8s on my stock LS6 and picked up 8 to 12 hp under the curve, no additional total RWHP. I'm now running 1.7s YTs on my head and cammed Lingenfelter LS6. Both sets fit without any problems and both work/worked great. 
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Safety Car
Joined: Apr 2007
Posts: 3,582
Likes: 136
From: SoCal CA
How about the Scorpions advertised on the forum? They advertise no machining, lifetime warranty, using the stock push rods, with the stock valve covers. I'm also having trouble convincing myself that push rod length doesn't affect roller position on the valve stem. I'm not calling BS I just can't get it straight in my head. Check these out.
http://forums.corvetteforum.com/c5-t...3-and-ls9.html
http://forums.corvetteforum.com/c5-t...3-and-ls9.html
Thread Starter
Burning Brakes
Joined: Oct 2004
Posts: 984
Likes: 23
From: Florence SC
I'm not looking for HP gains, I'll never use what its got anyway. The cam in the car IS supposed to be over .600 lift so I'm sure the valves would welcome the reduced friction of the rockers sliding across their stem. I guess I'm leaning towards the Yellow Terras after the above comments, but I hate to buy what everyone else already has, unless they are just the obvious choice. Thanks for the suggestions, keep them coming.
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
I was given a free set of Harland Sharp RRs when I had to send my TF heads back for a free rebuild several years ago. They've run great, with no issues, and fit under the stock covers. Not a racer, or a hard runner, so I couldn't tell you about their toughness.
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Are they hitting the baffles or the heads? My valve covers have no baffles or bosses for the coil pack bolts.
Melting Slicks
Joined: Jun 2007
Posts: 2,543
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From: Toronto Ontario
St. Jude Donor '08
Burning Brakes
Joined: Aug 2003
Posts: 828
Likes: 1
From: Wichita Ks
I have no baffles or anything. I even took the shims out and pushrods. still held my covers up by .250 to .375. They also had no clearance on the pushrod side, rockers were rubbing the heads. The only thing different is I have Patriot Performance Heads with larger springs and valves.
Burning Brakes
Joined: Aug 2003
Posts: 828
Likes: 1
From: Wichita Ks
Maybe this also has a difference. I bought them through a vendor on here and they sent me granatelli 510001 and said they were the same thing, maybe they are not because i found this saying you might have to double up the gaskets. http://old.granatellimotorsports.com...ay.php?gid=114