Site Sponsors & Vendors
Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: Trunion Swap Complete

  1. #1
    VIP Member STL_G8GT's Avatar
    Join Date
    Jul 2009
    Location
    Estes Park, CO
    Posts
    5,011
    Post Thanks / Like

    Default Trunion Swap Complete

    Swapped out my Comp Trunions for the Straub/Smith Brothers kit.

    Here are the Comps after removal. Looks to be wear almost exclusively on the exhaust side.

    20180501_132646_HDR.jpg
    20180501_134238_HDR.jpg

    Cam specs in sig. Low miles.
    2009 PBM G8 GT
    Pat G 218/226 & TSP Dual 660s, ARP Bits, DSteck Tuned, Magnacharger Chrome 2300 1:1, RCR Ported/Polished TB, Blower, & L92 Heads w/ LS3 intake valves, Smith Brothers Trunion Bushing Kit, ARH 1 7/8 Magnaflow MidMuff/Solo Axlebacks, RotoFab, VaporWorx PWM 1:1 fuel system, ID1050x injectors
    Mike Norris Motorsports Catchcan, AEM 30-4100, JHP Boost/Fuel Gauge Pod
    TSW Nurburgring Matte Gray 18" w/Nitto 555 & 555R, Satin Black SS Brembo Fronts, BMR Trailing Arms, Pedders Sway Bars, Whiteline Bushings
    Gloss Black Valve Covers, 6k HID, V6 Handles, Interior/License Plate LEDs, Debadged, Holden Black Trim, Polk Dxi, GXP diffusor, a few bits from Crazy Paul

    Originally Posted by TonyKarter
    Anyone who has ever worked on a car has been in your position, and sitting cross-legged on a concrete floor with a dim shop light is its own kind of hell... Chalk it up as one of the rites of passage.
    RIP Charlie - GRRRR8
    RIP Chris Wells - Panzer Leader

  2. #2
    Beyond Help tchr49's Avatar
    Join Date
    Feb 2010
    Location
    michigan
    Posts
    1,892
    Post Thanks / Like

    Default

    Nice upgrade Pete. Something I should get around to...
    things are not what they appear to be.....

    2009.5 Liquid Red,Onyx Red, Premium Package, e85 Surprise Package

  3. #3
    VIP Member STL_G8GT's Avatar
    Join Date
    Jul 2009
    Location
    Estes Park, CO
    Posts
    5,011
    Post Thanks / Like

    Default

    I was shocked mine were in the shape they were. Great oil, not too many miles, and the cam is pretty mild, under 600 lift and easy single beehive springs.

    Either way, something isn't right with those comp kits.
    2009 PBM G8 GT
    Pat G 218/226 & TSP Dual 660s, ARP Bits, DSteck Tuned, Magnacharger Chrome 2300 1:1, RCR Ported/Polished TB, Blower, & L92 Heads w/ LS3 intake valves, Smith Brothers Trunion Bushing Kit, ARH 1 7/8 Magnaflow MidMuff/Solo Axlebacks, RotoFab, VaporWorx PWM 1:1 fuel system, ID1050x injectors
    Mike Norris Motorsports Catchcan, AEM 30-4100, JHP Boost/Fuel Gauge Pod
    TSW Nurburgring Matte Gray 18" w/Nitto 555 & 555R, Satin Black SS Brembo Fronts, BMR Trailing Arms, Pedders Sway Bars, Whiteline Bushings
    Gloss Black Valve Covers, 6k HID, V6 Handles, Interior/License Plate LEDs, Debadged, Holden Black Trim, Polk Dxi, GXP diffusor, a few bits from Crazy Paul

    Originally Posted by TonyKarter
    Anyone who has ever worked on a car has been in your position, and sitting cross-legged on a concrete floor with a dim shop light is its own kind of hell... Chalk it up as one of the rites of passage.
    RIP Charlie - GRRRR8
    RIP Chris Wells - Panzer Leader

  4. #4
    Administrator Chewy's Avatar
    Join Date
    Aug 2008
    Location
    Bettendorf, IA
    Posts
    7,323
    Post Thanks / Like

    Default

    I went with the Manton bushing kit. They use tool steel so strong as hell. I have over .600 lift though and dual .660 BT springs.

    Looking forward to getting the bearings out!

    Photo is stock trunnion compared to the Manton. I bought all new rockers and pressed out the brand new trunnions and pressed in the Mantons. This way it's R&R and no down time.
    Attached Images Attached Images

    2009.5 MSM GXP 500ish N/A RWHP. Mods include but aren't limited to: Texas Speed 418 (6.8L) fully forged held together with ARP from top to bottom, PRC 255cc heads, Rick Crawford intake plenum, TB port, polish and tune, Roto-Fab 102mm CAI w/LS7 MAF, Kooks 1-7/8" headers wrapped with DEI, Corsa catless system, Circle D 3200 Stall, 3.45 final drive, BMR's complete street bushing kit and sway bars, Eibach Pro Kit, G-Force Axles, running on staggered VMR 710's with Bridgestone RE11 rubber. HSV triple gauge pack with Calais smokers kit mod, V6 tails, debadge/rebadge, V6 door handles, AU black door trim, Maverick Man under hood strut covers, & washer and bolt kit, fully corrected paint thanks to Adams Polishes and my hard work. Built with reliability in mind with some power for those times when you need to pass or go over a big hill. Just a poser, not a racer!

  5. #5
    VIP Member norm8332's Avatar
    Join Date
    Aug 2008
    Location
    Near Buffalo, NY
    Posts
    2,592
    Post Thanks / Like

    Default

    Quote Originally Posted by STL_G8GT View Post
    Swapped out my Comp Trunions for the Straub/Smith Brothers kit.

    Here are the Comps after removal. Looks to be wear almost exclusively on the exhaust side.

    20180501_132646_HDR.jpg
    20180501_134238_HDR.jpg

    Cam specs in sig. Low miles.
    Comps are junk. I'm done with Comp completely after this latest issue. Mine were worse than yours. I recommend anyone with them should change them unless they don't mind hardened metal bits in their engine. Everyone I have seen check them (disassemble) had that wear. I went back to stock.
    Last edited by norm8332; 05-03-2018 at 02:37 PM.
    08 G8 GT: MagnaCharger TVS MP1900 10psi, LS9 cam, 72# injectors, Roto-Fab CAI, SLP Headers, Corsa Catback, etc.
    My Garage

  6. #6
    Administrator Chewy's Avatar
    Join Date
    Aug 2008
    Location
    Bettendorf, IA
    Posts
    7,323
    Post Thanks / Like

    Default

    Quote Originally Posted by norm8332 View Post
    I went back to stock.
    IMO, that's worse! They're now pressed in (not held by a clip) and a much weaker design. The bushings seem to be the way to go.

    2009.5 MSM GXP 500ish N/A RWHP. Mods include but aren't limited to: Texas Speed 418 (6.8L) fully forged held together with ARP from top to bottom, PRC 255cc heads, Rick Crawford intake plenum, TB port, polish and tune, Roto-Fab 102mm CAI w/LS7 MAF, Kooks 1-7/8" headers wrapped with DEI, Corsa catless system, Circle D 3200 Stall, 3.45 final drive, BMR's complete street bushing kit and sway bars, Eibach Pro Kit, G-Force Axles, running on staggered VMR 710's with Bridgestone RE11 rubber. HSV triple gauge pack with Calais smokers kit mod, V6 tails, debadge/rebadge, V6 door handles, AU black door trim, Maverick Man under hood strut covers, & washer and bolt kit, fully corrected paint thanks to Adams Polishes and my hard work. Built with reliability in mind with some power for those times when you need to pass or go over a big hill. Just a poser, not a racer!

  7. #7
    VIP Member norm8332's Avatar
    Join Date
    Aug 2008
    Location
    Near Buffalo, NY
    Posts
    2,592
    Post Thanks / Like

    Default

    Quote Originally Posted by Chewy View Post
    IMO, that's worse! They're now pressed in (not held by a clip) and a much weaker design. The bushings seem to be the way to go.
    You have your opinion. A lot of big reputable shops insist on stock unless it's an extreme cam. The stockers got a bad rap some years ago when a bad batch made it to the wild in the LS7. I did do some research before going back.
    Last edited by norm8332; 05-08-2018 at 06:49 AM.
    08 G8 GT: MagnaCharger TVS MP1900 10psi, LS9 cam, 72# injectors, Roto-Fab CAI, SLP Headers, Corsa Catback, etc.
    My Garage

  8. #8
    Administrator Chewy's Avatar
    Join Date
    Aug 2008
    Location
    Bettendorf, IA
    Posts
    7,323
    Post Thanks / Like

    Default

    Quote Originally Posted by norm8332 View Post
    You have your opinion.
    YEP, but it's not just mine mind you! I just hope yours is right! IMO, it's a bit like playing Russian Roulette. I have too much money in my engine to hope I didn't get a "bad batch".

    2009.5 MSM GXP 500ish N/A RWHP. Mods include but aren't limited to: Texas Speed 418 (6.8L) fully forged held together with ARP from top to bottom, PRC 255cc heads, Rick Crawford intake plenum, TB port, polish and tune, Roto-Fab 102mm CAI w/LS7 MAF, Kooks 1-7/8" headers wrapped with DEI, Corsa catless system, Circle D 3200 Stall, 3.45 final drive, BMR's complete street bushing kit and sway bars, Eibach Pro Kit, G-Force Axles, running on staggered VMR 710's with Bridgestone RE11 rubber. HSV triple gauge pack with Calais smokers kit mod, V6 tails, debadge/rebadge, V6 door handles, AU black door trim, Maverick Man under hood strut covers, & washer and bolt kit, fully corrected paint thanks to Adams Polishes and my hard work. Built with reliability in mind with some power for those times when you need to pass or go over a big hill. Just a poser, not a racer!

  9. #9
    VIP Member norm8332's Avatar
    Join Date
    Aug 2008
    Location
    Near Buffalo, NY
    Posts
    2,592
    Post Thanks / Like

    Default

    I see where you're coming from, but most of the documented failures from the bad batch were specifically in 2007 manufactured LS7s and those were many, thus the bad rep. If I had a build like yours I would consider an alternative. But mine is a completely stock bottom end with a mild LS9 cam.
    Last edited by norm8332; 05-08-2018 at 07:22 AM.
    08 G8 GT: MagnaCharger TVS MP1900 10psi, LS9 cam, 72# injectors, Roto-Fab CAI, SLP Headers, Corsa Catback, etc.
    My Garage

  10. #10
    Senior Member joemomma's Avatar
    Join Date
    Oct 2009
    Location
    Southern Maryland
    Posts
    439
    Post Thanks / Like

    Default

    Quote Originally Posted by Chewy View Post
    I went with the Manton bushing kit. They use tool steel so strong as hell. I have over .600 lift though and dual .660 BT springs.

    Looking forward to getting the bearings out!

    Photo is stock trunnion compared to the Manton. I bought all new rockers and pressed out the brand new trunnions and pressed in the Mantons. This way it's R&R and no down time.
    Who did you buy your Manton Kit from?


    Sent from my iPhone using Tapatalk
    2009 SBM GT... 427rwhp... Best 1/4 mile 11.98@112.50...

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •