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  #1  
Old 04-03-2012, 07:08 PM
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Valve Springs

I was hoping some of you could give me your thoughts on what HP level/boost levels the stock valve springs would hold. My build is a step at a time as funds permit. I doubt I will ever see any huge numbers, but hope to get ‘er up to around 700ish RWHP, but it has to be RELIABLE. The heads are coming off in a few weeks and I was wondering if I need or will eventually need to upgrade valve springs? I know the pros of upgrading are to reduce the risk of valve float. Are there any drawbacks to running heavier springs at the 630-650 HP level, especially from a reliability standpoint? My truck is DD.
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Old 04-04-2012, 03:30 AM
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Give Aaron from Rudy's Diesel a call he should be able to answer your question.
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Old 04-04-2012, 05:43 AM
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I am also curious about this. If i have to take the valve covers off i am planning on upgraded push rods but i am not sure about the valve springs.
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Old 04-04-2012, 08:06 AM
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Quote:
Originally Posted by 04hdfatboy View Post
I am also curious about this. If i have to take the valve covers off i am planning on upgraded push rods but i am not sure about the valve springs.
I was planning on doing the upgrade to the pushrods also, but I was told by one reputable source that valve springs were more important. Theoretically, anytime your boost or drive pressure/backpressure exceed your spring capacity, the valve could float. With that being said, theoretically with the 6.4s, it would be most likely the exhaust valve due to high drive pressure/exhaust back pressure. I am not sure what the factory springs are rated at and I was hoping someone might be able to provide an answer from real world experiences.
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Old 04-04-2012, 08:09 AM
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Originally Posted by B585Ford View Post
I was planning on doing the upgrade to the pushrods also, but I was told by one reputable source that valve springs were more important. Theoretically, anytime your boost or drive pressure/backpressure exceed your spring capacity, the valve could float. With that being said, theoretically with the 6.4s, it would be most likely the exhaust valve due to high drive pressure/exhaust back pressure. I am not sure what the factory springs are rated at and I was hoping someone might be able to provide an answer from real world experiences.
Good to know. Maybe Aaron or Erick will chime in and give us their thoughts.
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Old 04-06-2012, 03:25 AM
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I would upgrade the valve train especially if your tearing it down for head studs. That's what I did for piece of mind. An extra 800 seemed like a good investment since the heads were already off.


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Old 04-06-2012, 09:15 AM
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Originally Posted by amb82 View Post
I would upgrade the valve train especially if your tearing it down for head studs. That's what I did for piece of mind. An extra 800 seemed like a good investment since the heads were already off.


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Do you know of any drawbacks to running a heavier spring??? valve stem wear??? rocker wear??? I'm not worried about the pushrods because I will upgrade them while doing valve springs.
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Old 04-08-2012, 06:10 PM
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I can confirm that Jeff is still running stock valve springs and push rods.
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Old 04-08-2012, 06:34 PM
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Yes his valve train is still stock. I think that's fine but I upgraded while the cab was off just to plan ahead for when I go for more power.
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Old 04-08-2012, 07:17 PM
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Originally Posted by amb82 View Post
Yes his valve train is still stock. I think that's fine but I upgraded while the cab was off just to plan ahead for when I go for more power.
Are there cons to the upgrade, especially in terms of reliability?
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