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Old 12-25-2012, 03:54 PM   #1
dblaron
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Default Springs for 1.85 rockers

Thanks to an awesome wife and a suggestion from an abominable friend, I ended up with a set of 1.85 rockers for Christmas! I ordered the 1.450 pushrods already. My question to the guru's out there. I picked up a new set of ls3 springs from a member on here, these should be fine for the rockers, correct? I still have the stock cam installed, I believe I should be ok but I wanted to hear from some experts. Thanks
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Old 12-25-2012, 04:01 PM   #2
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You need to know at what lift the springs will bind at. Then just do the math and see if the 1.85 rockers would put you over what the springs will bind at. Its always best to leave a little room to play as well, say the springs bind at 700 lift then try to keep the actual lift at the valve no more then 680 that way you never come close to making the springs bind.
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Old 12-25-2012, 05:23 PM   #3
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From the GMPP catalog

12586484
Valve Springs (not shown)
• Beehive style springs • Standard LS6/LS3 springs
• Use cap P/N 10166344 • 1.250" @ 295 lbs. pressure
• 1.800" installed height • Max lift .570"
@ 90 lbs. pressure

I was thinking that because they are good to .570 lift that I am good.

This is quoted from another board. I hope he doesn't mind.

"The test engine was a 2009.5 G8 GT with a 6.0L L76 engine with active fuel management (DOD). All AFM motors are saddled with a very small 200/208 .472/.474" 116LSA camshaft. The 1.85 rockers would effectively increase the lift at the valve from .472 to .514". This small but noticeable increase in lift will get the large intake valve further away from the cylinder wall plus into a position where it flows more air. Effectively my engine now has a 200/208 .514/.516" cam."

Anybody see any reason they wont work?
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12.23 @ 113.7 mph 1.98 60' 1,000' DA

20X9-35 TSW Nurburings 275/35 Mickey Thompson Street Comps
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Old 12-25-2012, 06:40 PM   #4
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I'm not sure if the LS3 springs will be stout enough. The L92 heads have heavier intake valves and will have a higher demand on the springs than LS3 heads running the lighter valves. I would recommend some PAC 1218 or 1518 springs for peace of mind.
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Old 12-25-2012, 07:32 PM   #5
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doi need springs and everything or wll 1.85 rockers work alone?
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Old 12-25-2012, 07:59 PM   #6
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Quote:
Originally Posted by Patrick G View Post
I'm not sure if the LS3 springs will be stout enough. The L92 heads have heavier intake valves and will have a higher demand on the springs than LS3 heads running the lighter valves. I would recommend some PAC 1218 or 1518 springs for peace of mind.
That's exactly what I was looking for. Thanks Pat. I guess I will have some springs for sale if you are telling me they won't work. Would those springs you recommend work for a future cam upgrade? (Yeti cam)?
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2009 GT Prem. Sport. Sun Roof.
Paddle Shifters, BMR Sways, Eibachs, Koni's, Brembos, 3.45s, LS2 cam, 918 springs, 1.85 rockers, Spectre CAI, Rick C Intake/TB/heads , LS7 MAF, Custom Axle Backs, JBA LT's,

Pat G Tuned.

12.23 @ 113.7 mph 1.98 60' 1,000' DA

20X9-35 TSW Nurburings 275/35 Mickey Thompson Street Comps
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Old 12-25-2012, 10:33 PM   #7
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Quote:
Originally Posted by dblaron View Post
That's exactly what I was looking for. Thanks Pat. I guess I will have some springs for sale if you are telling me they won't work. Would those springs you recommend work for a future cam upgrade? (Yeti cam)?
yes they will work for a cam like mine. Here is the springs Pat Recommended for my cam...

Quote:
Recommended valve spring: PAC 1518 or Comp 26918 beehive.
Remember, he recommended those springs to me with the fact that I was retaining DOD and using the stock valves....
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Pat G Tune & DOD cam, Rick C Intake & TB, 4IN LS7 MAF, Ported stock Heads, Circle D 2600 Stall
VCM CAI, OBX Exhaust, SLP UDP,H&Rs, Koni Shocks
BP catch can, BMR Susp/bush/chasis, Brembo's, Slotted/Drilled Rotors, 3.27 Gears, Zex Wet Shot


Bolt ons Street tires
12.649@107.817 60ft 1.96 Da 700ft

Heads/Cam pre stall Street tires
12.16@114.21 60ft 1.75 Da -200

After Stall
11.82@115.9 60ft 1.66 DA 400ft

Zex 125shot
11.68@123.19 60ft 1.95 DA 200ft
second gear pull
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Old 12-26-2012, 10:38 AM   #8
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Quote:
Originally Posted by dblaron View Post
Thanks to an awesome wife and a suggestion from an abominable friend, I ended up with a set of 1.85 rockers for Christmas! I ordered the 1.450 pushrods already. My question to the guru's out there. I picked up a new set of ls3 springs from a member on here, these should be fine for the rockers, correct? I still have the stock cam installed, I believe I should be ok but I wanted to hear from some experts. Thanks
Yes. I ran mine with stock springs and valves with no issues. If you are worried, you can shim the LS3 springs .030-.050" when you install them. Even shimmed .050 still gives you .005" from max lift range on the spring.
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2.00 60ft 13.06 @ 106.6 1.85 SLP Rocker HPTuner
1.97 60ft, 12.87 @107.7 3.45's and Custom exhaust w/manifolds
1.94 60ft, 12.57 @111.9 217/225 Lunati Cam
2.03 60ft, 12.37 @115.3 Doug Thorley headers
1.94 60ft, 12.20 @ 115.0 Comp 219/233 Thumpr Cam
1.72 60ft, 11.65 @ 118.6 221/233 DoD Cam 2600 stall, street tires, Crawford ported heads and Intake
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Old 12-28-2012, 03:21 PM   #9
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Found rockers so my question is wht would happen if I just change the rockers and nothing else? Trying to avoi d the springs since they are a pain


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12.6 @109-old tune
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Old 12-28-2012, 03:34 PM   #10
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Stock or LS3 springs are fine for the .514" lift. The LS3 cam has more lift anyway.
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Old 12-28-2012, 03:48 PM   #11
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So I can just order the rockers correct?


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kooks LT headers, hi flow cats, x pipe, corsa exhaust, Vararam CAI, ported TB/intake manifold, underdrive pulley, catch can, qtp electric cut outs, 160 t stat, HSRK, H&R lowering springs, BMR sway bar

12.6 @109-old tune
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Old 12-28-2012, 04:11 PM   #12
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Quote:
Originally Posted by joeygr8gt View Post
So I can just order the rockers correct?


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I would recommend rockers and 7.450" pushrods.
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2009 G8 GT- Rick Crawford
2.00 60ft 13.06 @ 106.6 1.85 SLP Rocker HPTuner
1.97 60ft, 12.87 @107.7 3.45's and Custom exhaust w/manifolds
1.94 60ft, 12.57 @111.9 217/225 Lunati Cam
2.03 60ft, 12.37 @115.3 Doug Thorley headers
1.94 60ft, 12.20 @ 115.0 Comp 219/233 Thumpr Cam
1.72 60ft, 11.65 @ 118.6 221/233 DoD Cam 2600 stall, street tires, Crawford ported heads and Intake
1.53 60ft, 10.59@ 129.7 ALL MOTOR!!! N/A G8 Record Holder
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Old 12-28-2012, 04:54 PM   #13
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Pushrods easy to change?


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12.6 @109-old tune
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Old 12-28-2012, 06:00 PM   #14
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Yep. Pull out as soon as you take off the rockers.

Quote:
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Pushrods easy to change?


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2009 G8 GT- Rick Crawford
2.00 60ft 13.06 @ 106.6 1.85 SLP Rocker HPTuner
1.97 60ft, 12.87 @107.7 3.45's and Custom exhaust w/manifolds
1.94 60ft, 12.57 @111.9 217/225 Lunati Cam
2.03 60ft, 12.37 @115.3 Doug Thorley headers
1.94 60ft, 12.20 @ 115.0 Comp 219/233 Thumpr Cam
1.72 60ft, 11.65 @ 118.6 221/233 DoD Cam 2600 stall, street tires, Crawford ported heads and Intake
1.53 60ft, 10.59@ 129.7 ALL MOTOR!!! N/A G8 Record Holder
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Old 12-28-2012, 09:11 PM   #15
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Install your new push rods by putting them in there where the old ones came out.
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Pat G Tune & DOD cam, Rick C Intake & TB, 4IN LS7 MAF, Ported stock Heads, Circle D 2600 Stall
VCM CAI, OBX Exhaust, SLP UDP,H&Rs, Koni Shocks
BP catch can, BMR Susp/bush/chasis, Brembo's, Slotted/Drilled Rotors, 3.27 Gears, Zex Wet Shot


Bolt ons Street tires
12.649@107.817 60ft 1.96 Da 700ft

Heads/Cam pre stall Street tires
12.16@114.21 60ft 1.75 Da -200

After Stall
11.82@115.9 60ft 1.66 DA 400ft

Zex 125shot
11.68@123.19 60ft 1.95 DA 200ft
second gear pull
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Old 12-28-2012, 09:57 PM   #16
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so sticking with stock springs might allow for a little more HP over a heavier spring? u just *might* float a valve under extreme conditions??
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Old 12-28-2012, 10:15 PM   #17
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so sticking with stock springs might allow for a little more HP over a heavier spring? u just *might* float a valve under extreme conditions??
Basically. Valve float can cause issues that are not cheap to fix. For the peace of mind I would sacrifice a negligible amount of HP for peace of mind.
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Pat G Tune & DOD cam, Rick C Intake & TB, 4IN LS7 MAF, Ported stock Heads, Circle D 2600 Stall
VCM CAI, OBX Exhaust, SLP UDP,H&Rs, Koni Shocks
BP catch can, BMR Susp/bush/chasis, Brembo's, Slotted/Drilled Rotors, 3.27 Gears, Zex Wet Shot


Bolt ons Street tires
12.649@107.817 60ft 1.96 Da 700ft

Heads/Cam pre stall Street tires
12.16@114.21 60ft 1.75 Da -200

After Stall
11.82@115.9 60ft 1.66 DA 400ft

Zex 125shot
11.68@123.19 60ft 1.95 DA 200ft
second gear pull
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Old 12-28-2012, 10:36 PM   #18
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I hear ya, thanks again Yeti
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Old 12-30-2012, 08:49 AM   #19
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I used LS6 springs with my 1.85s for a year. I would not use stockers. LS3 and LS6 springs are an inexpensive alternative, and I spun mine to 6200rpm regularly.
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Old 12-30-2012, 11:09 AM   #20
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There's an idea thank you!
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