Rocker Arms-increased ratio worth it?
Thread Starter
Launching!
Joined: Nov 2001
Posts: 254
Likes: 0
From: NC
Rocker Arms-increased ratio worth it? Looks like all of the 1.8:rockers cost a ton, but a substantiall savings in labor over doing a cam (in a Vette anyway).
Any dyno comparison of a LS1/LS6/LS2 with stock rockers, vs high lift rockers? Just wondering if you can gain anything with extra lift but stock duration.
I may do heads as well, but really don't want to tear into the timing cover (gotta remove the steering rack in the C5/C6)
Thanks
Any dyno comparison of a LS1/LS6/LS2 with stock rockers, vs high lift rockers? Just wondering if you can gain anything with extra lift but stock duration.
I may do heads as well, but really don't want to tear into the timing cover (gotta remove the steering rack in the C5/C6)
Thanks
TECH Resident
Joined: Dec 2001
Posts: 922
Likes: 1
From: Lexington Park, MD
Go for the heads too 
sliding the rack out takes no time at all - just got done doing it a couple hours ago.
What are you driving these days Dave? Are you still racing? Did you decide to keep the car? I'm the one that was working with Donovan on his WC kit. His car is for sale if you know anyone looking.
sliding the rack out takes no time at all - just got done doing it a couple hours ago. What are you driving these days Dave? Are you still racing? Did you decide to keep the car? I'm the one that was working with Donovan on his WC kit. His car is for sale if you know anyone looking.
Originally Posted by mike c.
for the money on the rockers,you will not make a gain that is worth it. even a z06 cam will net you 15hp and it's still a stock cam. for the money vs hp....get a cam.
Teching In
Joined: Nov 2005
Posts: 16
Likes: 0
From: Metro Detroit
The 1.8 roller rockers will increase lift appox. .031 and increse duration. I got my Yella Terra 1.8 shaft mounted roller rockers from TR for $500. The fit right the first time with no mods needed to the rocker covers. When I did mine I added Chromoly push rods and Comp 918 springs. What a difference this combo makes. 
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A very easy an accurate way of knowing how much extra lift you get is by taking your actual lobe lift and multipling it by your rocker arm ratio....... .300 * 1.5 = .450 for example. Rockerarm ratio is determined by the distances between the pushrod cup, the rocker pivot and the tip that pushes agaist the valve stem.
Ron
Ron
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Launching!
Joined: Feb 2004
Posts: 233
Likes: 1
From: STL, MO
I vote for doing the cam kit also! easily expect 30+ at the tires with a cam kit and a tune..you can get just about any shop to do the cam swap for a reasonable price and why take the heads off and leave a stock cam in??
I have seen 15-18hp from 1.8 rocker and Harland Sharps are cheap. Yes a cam swap will increase more but for the money and drivability? 1.8 rockers are for those that do not want to go into a cam swap.
Nate
Nate
