Rocker Arms ?
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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.
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Joined: Oct 2005
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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?
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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.
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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.
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Joined: Oct 2005
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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.
