Valve Springs - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 35 Old 04-03-2012, 07:08 PM Thread Starter
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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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2008 F350 ZF6 daily driver
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post #2 of 35 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.

2008 F450 King Ranch 4X4
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post #3 of 35 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.

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #4 of 35 Old 04-04-2012, 08:06 AM Thread Starter
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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.

2008 F350 ZF6 daily driver
No Limits CAI and every air mod, MM w/ GH, DPF/CAT delete 5", Sean's 4" DP, SB DD 3850, Coolant Filter, Bushwacker flares, 2.5" Icon level, SD inserts tailgate/grill, PMF Tbars w/ 5" block, Elite EGR delete, Junior High Power Atmo, ARP studs, A-1000 (Marty's), Fuel Bowl Delete, 15% nozzles, Tial WG
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Please see this thread:
http://www.powerstroke.org/forum/pow...l#post10310033
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post #5 of 35 Old 04-04-2012, 08:09 AM
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Quote:
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.

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #6 of 35 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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post #7 of 35 Old 04-06-2012, 09:15 AM Thread Starter
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Quote:
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.

2008 F350 ZF6 daily driver
No Limits CAI and every air mod, MM w/ GH, DPF/CAT delete 5", Sean's 4" DP, SB DD 3850, Coolant Filter, Bushwacker flares, 2.5" Icon level, SD inserts tailgate/grill, PMF Tbars w/ 5" block, Elite EGR delete, Junior High Power Atmo, ARP studs, A-1000 (Marty's), Fuel Bowl Delete, 15% nozzles, Tial WG
God Bless our military!!!!
Please see this thread:
http://www.powerstroke.org/forum/pow...l#post10310033
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post #8 of 35 Old 04-08-2012, 06:10 PM Thread Starter
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I can confirm that Jeff is still running stock valve springs and push rods.

2008 F350 ZF6 daily driver
No Limits CAI and every air mod, MM w/ GH, DPF/CAT delete 5", Sean's 4" DP, SB DD 3850, Coolant Filter, Bushwacker flares, 2.5" Icon level, SD inserts tailgate/grill, PMF Tbars w/ 5" block, Elite EGR delete, Junior High Power Atmo, ARP studs, A-1000 (Marty's), Fuel Bowl Delete, 15% nozzles, Tial WG
God Bless our military!!!!
Please see this thread:
http://www.powerstroke.org/forum/pow...l#post10310033
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post #9 of 35 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.

2010 F-250 Cabelas Edition
Sct with Gearhead tunes, 4" afe dpf delete exhaust, leveled on 22's
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post #10 of 35 Old 04-08-2012, 07:17 PM Thread Starter
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Quote:
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?

2008 F350 ZF6 daily driver
No Limits CAI and every air mod, MM w/ GH, DPF/CAT delete 5", Sean's 4" DP, SB DD 3850, Coolant Filter, Bushwacker flares, 2.5" Icon level, SD inserts tailgate/grill, PMF Tbars w/ 5" block, Elite EGR delete, Junior High Power Atmo, ARP studs, A-1000 (Marty's), Fuel Bowl Delete, 15% nozzles, Tial WG
God Bless our military!!!!
Please see this thread:
http://www.powerstroke.org/forum/pow...l#post10310033
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