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
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.
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."
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)?
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.
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.
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.
What are you refering to? The springs or rockers? The springs are a direct swap, the rockers, for whatever reason, hit the valve cover on yeti's car. Nothing a dremel can't fix. I used an air die grinder but the idea is the same.
Others have installed the rockers with no issues so I'm curious if this was just a flaw from the factory in yeti's valve cover. Check out his thread. They were very straight forward to install.
Yea, what springs? I paid almost 600 for my rockers.....
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