Rocker arm selection ???
Thread Starter
Racer
Joined: Aug 2010
Posts: 309
Likes: 1
From: Mendota IL
Rocker arm selection ???
I'll be starting to get parts for a small build quite soon on my '00 C5 and am now trying to figure out the proper rocker arms to use for a cam with around .600 lift. I understand the stock LS1 rocker arms are not a good choice for bigger cams, I'm assuming mine with have near .600 lift per Camshaft Innovations. Below is the list of mods for the build. Please chime-in if you'd like. Thank you in advance.
-Stock LS1 shortblock
-Double roller timing chain
-PRC 220cc 5.3L stage 2.5 heads from Texas Speed
-Trick Flow 5/16" dia, 7.5" Chromemoly pushrods
-Camshaft Innovations custom cam (pending response from Jay)
-LS6 Intake & TB
-80mm or 85mm MAF
-CAI
-Texas Speed 1 3/4" FL headers & 3" X-pipe
Would LS6 or LS7 rockers be a good feasible choice?
Or adding Comp Cams Trunion Upgrade Kit be a good choice for this set up?
Thanks again,
Jarol
-Stock LS1 shortblock
-Double roller timing chain
-PRC 220cc 5.3L stage 2.5 heads from Texas Speed
-Trick Flow 5/16" dia, 7.5" Chromemoly pushrods
-Camshaft Innovations custom cam (pending response from Jay)
-LS6 Intake & TB
-80mm or 85mm MAF
-CAI
-Texas Speed 1 3/4" FL headers & 3" X-pipe
Would LS6 or LS7 rockers be a good feasible choice?
Or adding Comp Cams Trunion Upgrade Kit be a good choice for this set up?
Thanks again,
Jarol
Thread Starter
Racer
Joined: Aug 2010
Posts: 309
Likes: 1
From: Mendota IL
That depends somewhat on the cam design which I do not know right now because I haven't heard back from Jay at C.I. But since the shortblock will be stock I won't run the motor past 6,500 rpm. Using stock LS1 rockers with a cam over .550 lift can shorten valvetrain life due the angle the rockers rest on the push rods at a certain lift. So I guess that rules out the Trunion Kit.
Fyi- I would like the proper rocker arms for my set-up, not rockers that will just be "ok" to use and just "get me by for now" so to speak.
Fyi- I would like the proper rocker arms for my set-up, not rockers that will just be "ok" to use and just "get me by for now" so to speak.
Burning Brakes
Joined: Jun 2009
Posts: 1,022
Likes: 0
From: Concord NC
St. Jude Donor '10
What makes you think the geometry is that bad?
I turn my motor to 7200 with .612" lift using stock LS1 rockers and have a great wipe pattern -- much better than almost any roller rockers would be without proper shimming/setup.
I turn my motor to 7200 with .612" lift using stock LS1 rockers and have a great wipe pattern -- much better than almost any roller rockers would be without proper shimming/setup.
Safety Car
Joined: Oct 2007
Posts: 3,903
Likes: 1
From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
I run a .603/.609 lift cam with stock rockers and I have no problem....
Thread Starter
Racer
Joined: Aug 2010
Posts: 309
Likes: 1
From: Mendota IL
Per reading articles which advised not using stock LS1 rockers with cams over .550 lift due to the geometry and it will shorten the valvetrain life over time. They were believable because the geometry was explained.
Drifting
Joined: Jul 2005
Posts: 1,484
Likes: 27
From: Torrance Calif
I use the Comp Cams #1500 system, but you need to add a spacer (1/2") to get clearance in the valve cover.
You might also consider new lifters.
(I use Morel)
With that much lift, I would consider a FAST 90 or 105 and TB to match
You might also consider new lifters.
(I use Morel)
With that much lift, I would consider a FAST 90 or 105 and TB to match
Last edited by heavymetals; Jan 8, 2011 at 01:33 PM.
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Thread Starter
Racer
Joined: Aug 2010
Posts: 309
Likes: 1
From: Mendota IL
I'm getting the cam designed to work specifically with everything else I'm using, including the LS6 intake, TB and MAF. IMO, cam design/selection should be based upon the engine components that are being used. And to not base other engine components/mods on the cam being used. That said, I'm trying to figure which rockers I'll be using to notify the cam designer. I just don't want the rockers to limit the cam in some way, shape or form is all.
Last edited by R6cowboy; Jan 8, 2011 at 01:54 PM.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 326
From: CA.
St. Jude Donor '13-'14-'15
Melting Slicks
Joined: Sep 2003
Posts: 2,062
Likes: 117
I have used aftermarket rockers but always got valve-train unstability above 6700rpm.
My last build in the video below is with STOCK OEM rockers, ~0.620 lift and I spin it everyday to 7300rpm...red-line 7400 rpm...dyno tested 7500 rpm
Christian
My last build in the video below is with STOCK OEM rockers, ~0.620 lift and I spin it everyday to 7300rpm...red-line 7400 rpm...dyno tested 7500 rpm
Christian
Former Vendor
Joined: Apr 2006
Posts: 2,470
Likes: 2
From: Portland OR
St. Jude Donor '10-'11-'12
For that lift you would be fine by just rebuilding the stockers with the Comp cam kit.
The Yella Terra are a fine choice as well. If Hinson is still selling the YT at $375 I might be tempted to got that route just because. The Comp kit if you do it yourself is anywhere from $104- $134 depending on were you get it.
It's not a real difficult job but you do need some tools and a bench to work on. I've done so many I cant count and the other day for the first time ever I had one slip in the jig and nick the bearing just a tiny bit. I wont let it go out that way of course so I ordered a new set of bearings from Comp but it can happen...LOL
I offer them rebuilt on core exchange or will take yours and rebuild them with one day turn around. $199
The Yella Terra are a fine choice as well. If Hinson is still selling the YT at $375 I might be tempted to got that route just because. The Comp kit if you do it yourself is anywhere from $104- $134 depending on were you get it.
It's not a real difficult job but you do need some tools and a bench to work on. I've done so many I cant count and the other day for the first time ever I had one slip in the jig and nick the bearing just a tiny bit. I wont let it go out that way of course so I ordered a new set of bearings from Comp but it can happen...LOL
I offer them rebuilt on core exchange or will take yours and rebuild them with one day turn around. $199
Last edited by 99blancoss; Jan 8, 2011 at 04:08 PM. Reason: corrected grammar
