Experiences/thoughts with 1.85 rockers?
Thread Starter
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
Experiences/thoughts with 1.85 rockers?
Am thinking of adding SLP 1.85 rocker arms to my C5. Please see my Profile for mods. The car breathes very well and I have a low lift, .525 .531 Comp Cam. My understanding is that the rockers will add about 12rwhp (peak) and about 15-17 ftlbs rwtorque (peak) on a stock engine, so I expect more with my setup. Also, I understand the rockers have a fairly significant effect on "under the curve" power and torque. I do not want to change cams again, and thought this may give me just about what I want from the car. I have a great low end and the car pulls very hard. I had 3.73s in the car (twice) and it was really difficult to launch it quickly on street tires. They just wanted to spin. So, when my last set of 3.73s began to whine, I switched to 3.42s in the hope the car would be easier to launch quickly off the line. I was hoping the rockers may help regain some of the midrange jump lost to the gear change and give me a little more up top. Any input greatly appreciated. Thanks!
Ed
Ed
Burning Brakes
Joined: Jun 2009
Posts: 1,022
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From: Concord NC
St. Jude Donor '10
What lobes are used on your cam? With a 1.85 rocker I'd make sure you take the ramp rate of the camshaft into consideration and make sure the rest of the valvetrain is up to par to handle it. If you haven't changed valve springs already, you need to make sure you have some suitable aftermarket valve springs to handle the increased lift. With that small of a cam, there shouldn't be too many other concerns.
If it were me, I'd save the money from the rockers and put it towards throwing a bigger cam in it, as 1.85 is getting to be a pretty extreme rocker ratio which can lead to some interesting geometry.
If it were me, I'd save the money from the rockers and put it towards throwing a bigger cam in it, as 1.85 is getting to be a pretty extreme rocker ratio which can lead to some interesting geometry.
Last edited by mAydAy121; Mar 16, 2011 at 10:20 PM.
Thread Starter
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
What lobes are used on your cam? With a 1.85 rocker I'd make sure you take the ramp rate of the camshaft into consideration and make sure the rest of the valvetrain is up to par to handle it. If you haven't changed valve springs already, you need to make sure you have some suitable aftermarket valve springs to handle the increased lift. With that small of a cam, there shouldn't be too many other concerns.
If it were me, I'd save the money from the rockers and put it towards throwing a bigger cam in it, as 1.85 is getting to be a pretty extreme rocker ratio which can lead to some interesting geometry.
If it were me, I'd save the money from the rockers and put it towards throwing a bigger cam in it, as 1.85 is getting to be a pretty extreme rocker ratio which can lead to some interesting geometry.
Ed
Thread Starter
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
The SLPs, being a no-roller rocker will add very little, if any, weight to the valvetrain. They are nearly identical to the stock rockers except for the ratio. I also believe they are made by the same outfit. Should be extremely reliable. In addition, I have 2003 LS6 heads (w/918 springs) on the car with the lightweight sodium filled valves.
Ed
Last edited by C5XTASY; Mar 21, 2011 at 02:38 AM.
Tech Contributor
Joined: Jul 2002
Posts: 14,949
Likes: 263
From: St. Louis, MO
St. Jude Donor '08
Here are some recent 1.8 rocker results.
http://forums.corvetteforum.com/c6-t...a-rockers.html
If it was me I'd buy a FAST intake in a heartbeat over these rockers.
http://forums.corvetteforum.com/c6-t...a-rockers.html
If it was me I'd buy a FAST intake in a heartbeat over these rockers.
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Team Owner
Joined: Feb 2001
Posts: 27,226
Likes: 112
From: Short Hills, NJ
Even if it's a little more money (and it likely would be) I still think a cam is the better move, the stock rockers are fine (as long as they're in good shape). 
Thread Starter
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
Appreciate the feedback, but I already have an LS6 intake on the car and have been told that a FAST doesn't do a whole lot better on a stock displacement LS1. As far as a cam goes, I'm just trying to enhance the Comp XR269HR that I already have without having the engine torn apart again. My hope is to keep my low end and enhance the midrange through the top end by bolstering "under the curve" power and torque. I take this car all over the country so don't want to get too carried away. The car is pretty quick now and I'm just trying give it a little more kick from midrange on up to make up for my gear swap.
Ed
Ed
Tech Contributor
Joined: Jul 2002
Posts: 14,949
Likes: 263
From: St. Louis, MO
St. Jude Donor '08
Appreciate the feedback, but I already have an LS6 intake on the car and have been told that a FAST doesn't do a whole lot better on a stock displacement LS1. As far as a cam goes, I'm just trying to enhance the Comp XR269HR that I already have without having the engine torn apart again. My hope is to keep my low end and enhance the midrange through the top end by bolstering "under the curve" power and torque. I take this car all over the country so don't want to get too carried away. The car is pretty quick now and I'm just trying give it a little more kick from midrange on up to make up for my gear swap.
Ed
Ed
Good luck in your endeavors and
driving all over the country! That's the best way to see the country.
