Roller Rocker question for ya..
Thread Starter
Racer
Joined: Nov 2000
Posts: 449
Likes: 0
From: Greensboro, nc usa NC
Roller Rocker question for ya..
Just picked up some -COMP Cams Magnum Roller Tip Rockers
SMALL BLOCK CHEVY
3/8" Stud, 1.52 Ratio #1412-16
A friend said that I should have gotten the full rockers and changed the value cover to a tall. The Full rockers I wanted wouldnt fit under the stock valve cover.
He also said that I should go with the 1.6 ratio.
Here is the question. Is it worth it to go with the full roller rocker at 1.6 and change the valve cover, from the tips 1.5 I have with the stock valve cover??
If I am going to do it I want to get the best performance and do it right the first time -
Help please - thanks
Mark
SMALL BLOCK CHEVY
3/8" Stud, 1.52 Ratio #1412-16
A friend said that I should have gotten the full rockers and changed the value cover to a tall. The Full rockers I wanted wouldnt fit under the stock valve cover.
He also said that I should go with the 1.6 ratio.
Here is the question. Is it worth it to go with the full roller rocker at 1.6 and change the valve cover, from the tips 1.5 I have with the stock valve cover??
If I am going to do it I want to get the best performance and do it right the first time -
Help please - thanks
Mark
Pro
Joined: Oct 2001
Posts: 621
Likes: 1
I have the GM self-aligning 1.6 ratio full roller rockers under my stock valve covers. Have to use two gaskets, but it does fit.
You'll get a lot of opinions about whether there is any performance gain or not. I can't tell, because I did a few other changes at the same time. But I do know I'm getting another 30 thousandths lift at the valve, which can't hurt.
You'll get a lot of opinions about whether there is any performance gain or not. I can't tell, because I did a few other changes at the same time. But I do know I'm getting another 30 thousandths lift at the valve, which can't hurt.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
The only reason to go to a full roller is if spring pressure is over 300 pounds. Most of the solid and hyd flat tappet cams don't come close to this. You will gain a little HP with the 1.6 vs. 1.5 but not enough to really notice. Roller rockers are really needed for roller cams but the roller tips will work fine. I have been running them on my car for quite a while at 7000 rpm and spring pressure of 290 open and they are working great. They also fit under the stock covers. Keep the roller tips.
Thread Starter
Racer
Joined: Nov 2000
Posts: 449
Likes: 0
From: Greensboro, nc usa NC
Here are the specs on the cam I am running -
Part Number 12-211-2
Engine 1955-1998 Chevrolet
262ci-400ci
8cyl.
Grind Number CS 270H-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.47 0.47
Duration At 0.006 Tappet Lift 270 270
Valve Timing At 0.006
Open Close
Intake 29 61
Exhaust 69 21
These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 224 224
Lobe Lift 0.313 0.313
Lobe Separation 110
Recommended Valve Springs 981-16
Part Number 12-211-2
Engine 1955-1998 Chevrolet
262ci-400ci
8cyl.
Grind Number CS 270H-10
Description
Intake Exhaust
Valve Adjustment 0 0
Gross Valve Lift 0.47 0.47
Duration At 0.006 Tappet Lift 270 270
Valve Timing At 0.006
Open Close
Intake 29 61
Exhaust 69 21
These Specs Are For The Cam Installed At 106 Intake CL
Intake Exhaust
Duration At 0.05 224 224
Lobe Lift 0.313 0.313
Lobe Separation 110
Recommended Valve Springs 981-16
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
There is no need to go to roller rockers with that cam. The 981-16 springs are quite mild springs and do not need roller rockers. I am running a .525 lift cam with my roller tips just fine. Save your money for something that will build HP.
Le Mans Master
Joined: Mar 2004
Posts: 7,470
Likes: 1,490
From: Little Rock AR
The difference in lift is about .030" from 1.5 rockers to 1.6 ratio rockers. You can put that into DD2K and get very little performance improvement. The 1.6 ratio rockers might require head mods to fit. The 1.52's are a bolt-on that fits under stock valve covers. Full rollerized rockers are overrated and overkill for most applications.
I realy like those Comp 1.52 cast steel roller tip rockers. I recomend them for just about everything now. I run them in my 69 Z/28 and I have installed a set on my L-82 engine this week. Great rockers and the price is nice too.
-Mark.
I realy like those Comp 1.52 cast steel roller tip rockers. I recomend them for just about everything now. I run them in my 69 Z/28 and I have installed a set on my L-82 engine this week. Great rockers and the price is nice too.
-Mark.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Instructor
Joined: Aug 2003
Posts: 141
Likes: 0
From: east providence ri
I have an Edelbrock 2102 cam (Intake 278°, Exhaust 288°, 5° ATDC, 29° ABDC, 44° BBDC, 10° BTDC, 112°, 107°). Will I benefit any by changing to roller tipped rockers? With my cam, should I get 1.5 or 1.6 ratio?
Any help would be greatly appreciated.
Chris
Any help would be greatly appreciated.
Chris
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Originally Posted by migraine99
I have an Edelbrock 2102 cam (Intake 278°, Exhaust 288°, 5° ATDC, 29° ABDC, 44° BBDC, 10° BTDC, 112°, 107°). Will I benefit any by changing to roller tipped rockers? With my cam, should I get 1.5 or 1.6 ratio?
Any help would be greatly appreciated.
Chris
Any help would be greatly appreciated.
Chris
Instructor
Joined: Aug 2003
Posts: 141
Likes: 0
From: east providence ri
Originally Posted by Gordonm
The benefit to going to a roller tip is a little less wear on the valve guide due to a little less loading. The big bebefit is the stock rockers usually only measure 1.46 to 1.48. Therefore you never really get the full lift the cam offers. The 1.6 will give you a little more out of your existing camso if you don't have them yet the 1.6s won't hurt.
Thread Starter
Racer
Joined: Nov 2000
Posts: 449
Likes: 0
From: Greensboro, nc usa NC
Here is what I decided to do -
I already have the comp Cams tip Rollers and I went ahead and bought the full Comp Cam Roller Magnum rocker / along with a tall valve covers. I am going to let my mechanic decide which to due and just return the unused ones. My head has been hurting on which set up to do
I will keep you posted -
Mark
I already have the comp Cams tip Rollers and I went ahead and bought the full Comp Cam Roller Magnum rocker / along with a tall valve covers. I am going to let my mechanic decide which to due and just return the unused ones. My head has been hurting on which set up to do
I will keep you posted -
Mark
Thread Starter
Racer
Joined: Nov 2000
Posts: 449
Likes: 0
From: Greensboro, nc usa NC
My car was rebuilt to LT-1 Specs - so I think, notice I say, think they are they the ones that should be with an LT1. I was thinking about replacing them but my mechanic said dont, they were pretty good.
Not sure if that makes sense...new at the mechanical thing
Mark
Not sure if that makes sense...new at the mechanical thing
Mark
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Cylinder heads are the key to making HP. The LT1 heads were good back in the early 70s. By todays standards I would use them for a door stop. Mine are tucked away in the basement. You would be far better off putting money into a set of new heads than trying to make the old heads work.
Thread Starter
Racer
Joined: Nov 2000
Posts: 449
Likes: 0
From: Greensboro, nc usa NC
Originally Posted by Gordonm
Cylinder heads are the key to making HP. The LT1 heads were good back in the early 70s. By todays standards I would use them for a door stop. Mine are tucked away in the basement. You would be far better off putting money into a set of new heads than trying to make the old heads work.
thanks
Mark
