Rocker Arms ?
Thread Starter
Teching In
Joined: Mar 2008
Posts: 29
Likes: 0
Rocker Arms ? i have a 95' z28 and im doin a cam swap with a cc503. My question is 1: is there a big difference between 1.52 rockers and 1.6, if so what? and 2: Do any 1.6 rockers work with this cam or no, any answers would be great. Thanks
You wont have piston to valve clearance issues with 1.6's and the cc503.
Here is the lift benefit of 1.6's over 1.52's with that cam:
Lift with stock 1.5's = .503/.510
Lift with 1.52's = .510/.517
Lift with 1.6's = .537/.544
1.52's would be a complete waste of time money IMO as you can see. The 1.6RR's will yeild you more hp. 99% of guys running that cam including myself just recently, use it with 1.6RR's.
Here is the lift benefit of 1.6's over 1.52's with that cam:
Lift with stock 1.5's = .503/.510
Lift with 1.52's = .510/.517
Lift with 1.6's = .537/.544
1.52's would be a complete waste of time money IMO as you can see. The 1.6RR's will yeild you more hp. 99% of guys running that cam including myself just recently, use it with 1.6RR's.
Last edited by StealthFormula; Apr 30, 2008 at 11:54 AM.
TECH Resident
Joined: Oct 2005
Posts: 781
Likes: 0
From: Taxme, Ohio
LT1 heads machined for 1.6 RR You wont have piston to valve clearance issues with 1.6's and the cc503.
Here is the lift benefit of 1.6's over 1.52's with that cam:
Lift with stock 1.5's = .503/.510
Lift with 1.52's = .510/.517
Lift with 1.6's = .537/.544
1.52's would be a complete waste of time money IMO as you can see. The 1.6RR's will yeild you more hp. 99% of guys running that cam including myself just recently, use it with 1.6RR's.
Here is the lift benefit of 1.6's over 1.52's with that cam:
Lift with stock 1.5's = .503/.510
Lift with 1.52's = .510/.517
Lift with 1.6's = .537/.544
1.52's would be a complete waste of time money IMO as you can see. The 1.6RR's will yeild you more hp. 99% of guys running that cam including myself just recently, use it with 1.6RR's.
While buying gaskets and bolts I was told that my GM LT4 hot cam kit with 1.6 RRs will result in .525 lift for both intake and exhaust valves. I'm told this will require machining of valve guides and spring pockets on my LT1 heads. Is this correct?
Trending Topics
Valve-to-piston clearance has a great deal more to do with duration and the profile of the cam lobe than it does with lift. It's difficult to estimate the possibility of interference even when you have numbers for duration @ .050 lift. Putting in any camshaft that's more aggressive than a base factory grind without checking the actual clearance is asking for problems. The more modifications that are made (things like, deck height, replacement valves, gasket thickness, lobe separation angle, intake centerline, rocker ratio, etc.) the greater the need for checking becomes. There's too much risk of a potentially catastrophic problem to justify cutting corners.
That's just my opinion.
That's just my opinion.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Possible issue Another aspect is the spring retainer/valve guide clearance. I remember when my buddy first put 1.6 rockers on his bone stock 95...he bent 4 push rods because the retainer was hitting the valve guide. The added lift was compressing the spring just enough extra to cause this problem.
Just a thought.
Just a thought.
TECH Resident
Joined: Oct 2005
Posts: 781
Likes: 0
From: Taxme, Ohio
Could your friend have possible mis-adjusted the preload? Yours is the only post other than someone explaining that they had bent, oddly enough, four valves after installing the cam, rockers and lifters which had drained down. The preload had been set in this condition. This apparently caused a huge pump up after the engine had started.
I don't know much about this so I'm just trying to get to the bottom of it all.
I don't know much about this so I'm just trying to get to the bottom of it all.
