Vavletrain's weak links
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Vavletrain's weak links logically, everything should be replaced for high RPM motors... but how much can everything take...
What RPM will each STOCK part break:
What RPM will each STOCK part will cause valve float:
Whats the biggest cam before each STOCK part will break:
Whats the biggest cam before each STOCK part will cause valve float:
- Hydrolic Lifters
- Pushrods
- Rocker Arms
- Springs
- Retainers
- Locks
- Valves
What RPM will each STOCK part break:
What RPM will each STOCK part will cause valve float:
Whats the biggest cam before each STOCK part will break:
Whats the biggest cam before each STOCK part will cause valve float:
- Hydrolic Lifters
- Pushrods
- Rocker Arms
- Springs
- Retainers
- Locks
- Valves
Last edited by greatskiiiier; Feb 10, 2009 at 03:50 PM.
If a cam goes in there Replace.....
Pushrods w/ Properly measured Chromoly
Springs
You can reuse the retainers if you stick with Beehive springs, go to Ti if using a Dual coil spring.
Lifters when you kill them, alot of that has to do with spring pressure.
Stock rockers last a long while, only on high rpm set ups do I see people opt for Jesel.
Valves and locks should not need replacing.
It really depends on what your goal is.
Pushrods w/ Properly measured Chromoly
Springs
You can reuse the retainers if you stick with Beehive springs, go to Ti if using a Dual coil spring.
Lifters when you kill them, alot of that has to do with spring pressure.
Stock rockers last a long while, only on high rpm set ups do I see people opt for Jesel.
Valves and locks should not need replacing.
It really depends on what your goal is.
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so with say PRC .660 springs, which have and open pressure of 390lbs would need new lifters due to the extra force required to open the springs?
so is it better to get springs rated for .600 for a .595 lift cam, or would prc .660 be the best
so is it better to get springs rated for .600 for a .595 lift cam, or would prc .660 be the best
TI retainers w/ compatible locks and seats for the springs
Chromemoly pr's
That is the only absolute requirements.
Now for the optional, recommended replacements
LS7 lifters
LS2 timing set
ported oil pump
Optional performance repalcements
Yella Terra rockers
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ok... but do you need such a stout spring for say a .595 lift cam? would it have an advantage? higher RPM without valve float? last longer?.. compared to say a spring rated for .600 lift
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ya that what i figured... im kinda looking at PRC 2.5 5.3s an they come with .660 springs.. and im looking to go with roughly a 228 .590 cam but figured id see if its worth replacing anything now while i try and save up funds
Those heads are a good choice. Great heads for the price. Have you looked at the 228R cam?
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From: Turnin' Wrenches Infractions: 005
But those are the advertised specs on the spring. You wont know exactly what the spring can take untill you get the springs you plan to use and have them measure to see where they coil bind. Also there is deflection in the valvetrain, not to mention its a hydraulic set up.
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From: Detroit Metro
Anybody who changes out springs should use an installed height micrometer to verify the setup. I suppose if you do a true drop in (stock everything on the valve side; valves, locks, retainers, seats) then you can probably get away with not checking them if you know the factory specs.
If you want to learn more, please take the time to read this: CransCams on Valve Springs
Ken
