LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

LT4 Cam Question

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Old Mar 19, 2006 | 03:17 PM
  #16  
Josh-'04 GTO's Avatar
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Re: LT4 Cam Question

Originally Posted by FastZinTennessee
If you don't mind running marginal, just good enough parts on your car, then I agree- upgrading the springs is completely unnecesary
Those springs are a perfect fit for the hotcam. If you're pumping more money into better springs, do yourself a favor and pump more money into a cam that can use them...
Old Mar 19, 2006 | 07:23 PM
  #17  
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Re: LT4 Cam Question

Originally Posted by Josh-'04 GTO
remember that it only takes one bad valvespring to ruin your day...
Which is a perfect reason to upgrade your LT4 springs!!

This really is a pointless argument. I'm not concerned with what will barely get the job done, I'm concerned with what I components I can put in my car and rely on. This is why I chose to upgrade the springs. It's a purely optional thing.

I personally would rather overbuild my car then get something just good enough. I'm **** about it, and I like to think it saves me grief later on. If you don't agree, then fine- it's your car build it how you want it.
Old Mar 19, 2006 | 07:55 PM
  #18  
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Re: LT4 Cam Question

Originally Posted by FastZinTennessee
Which is a perfect reason to upgrade your LT4 springs!!

This really is a pointless argument. I'm not concerned with what will barely get the job done, I'm concerned with what I components I can put in my car and rely on. This is why I chose to upgrade the springs. It's a purely optional thing.

I personally would rather overbuild my car then get something just good enough. I'm **** about it, and I like to think it saves me grief later on. If you don't agree, then fine- it's your car build it how you want it.
If you're going to "overbuild" your car, then when in hell would you run a hotcam? As I said before, if you're insistant on high-end valvesprings you might as well put in a cam that can put them to use. You're right that this is a pointless arguement...you're fighting a proven combo that works with pure hypothetical talk... "Barely gets the job done" is flat out wrong, whether you choose to accept that or not. I've got actual real-world experience with it and know it works...I guess we'll just agree to disagree.
Old Mar 19, 2006 | 10:32 PM
  #19  
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Re: LT4 Cam Question

Originally Posted by Josh-'04 GTO
you're fighting a proven combo that works with pure hypothetical talk... "Barely gets the job done" is flat out wrong, whether you choose to accept that or not. I've got actual real-world experience with it and know it works...I guess we'll just agree to disagree.
When the guy setting my cylinder heads up tests the springs and says "I can't believe they would sell you these springs for that cam. I thought you said this came packaged as a kit?" then I know something is amiss.

I guess the next time someone tells me face to face that something is not up to the task, I'll just tell them that some guy on the internet told me it would work, and then magically it will

If I could build a car based on what people tell me on the internet, my car would run 4's in the quarter, get 45 mpg, and never need any maintenance
Old Mar 20, 2006 | 04:51 PM
  #20  
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Re: LT4 Cam Question

Originally Posted by FastZinTennessee
When the guy setting my cylinder heads up tests the springs and says "I can't believe they would sell you these springs for that cam. I thought you said this came packaged as a kit?" then I know something is amiss.

I guess the next time someone tells me face to face that something is not up to the task, I'll just tell them that some guy on the internet told me it would work, and then magically it will

If I could build a car based on what people tell me on the internet, my car would run 4's in the quarter, get 45 mpg, and never need any maintenance
I thought that maybe my personal experience running the kit in a 350, a 355 (brothers car), and a 383 LT1 engines would make you feel a little better. After 5 F-bodies and too many years on this board, I guess I'm just "some guy"...another internet bench racer...

Last edited by Josh-'04 GTO; Mar 20, 2006 at 05:04 PM.
Old Mar 20, 2006 | 10:55 PM
  #21  
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Wink Re: LT4 Cam Question

Originally Posted by Josh-'04 GTO
I guess I'm just "some guy"...another internet bench racer...
No, you're just a guy who drives a Ford.

Good point Dwayne about the lighter valves. Josh, honestly, after reading your belief that increased spring pressure costs horsepower, I knew not to read any more of your post.
Old Mar 21, 2006 | 04:15 PM
  #22  
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Re: LT4 Cam Question

Originally Posted by chrism400
Good point Dwayne about the lighter valves. Josh, honestly, after reading your belief that increased spring pressure costs horsepower, I knew not to read any more of your post.
You don't think the cam encounters much more resistance to turning when you make a major jump in spring pressure?

Originally Posted by chrism400
No, you're just a guy who drives a Ford.
Wow, that's informative and constructive...

Last edited by Josh-'04 GTO; Mar 21, 2006 at 04:24 PM.
Old Mar 21, 2006 | 10:26 PM
  #23  
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Re: LT4 Cam Question

Originally Posted by Josh-'04 GTO
You don't think the cam encounters much more resistance to turning when you make a major jump in spring pressure?
I know it sounds like it should but, the same force to push up is pushing down on another lobe. It's not a significant loss. Plus, we are only talking about another 30 lbs. of pressure on the seat.
Old Mar 22, 2006 | 04:15 PM
  #24  
Josh-'04 GTO's Avatar
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Re: LT4 Cam Question

Originally Posted by chrism400
I know it sounds like it should but, the same force to push up is pushing down on another lobe. It's not a significant loss. Plus, we are only talking about another 30 lbs. of pressure on the seat.
Actually, that's not entirely accurate. That depends greatly on the spring chosen. You're right that on a mild upgrade it wouldn't be huge. This piece of an article from Hotrod's website laid it out pretty straightforward:

Originally Posted by hotrodmagazine
Since there are 16 valvesprings on a traditional two-valve V8 engine, the force exerted on the camshaft is considerable, even with relatively weak springs. This force resists the engine’s rotation, which costs horsepower. The stiffer the spring, the more horsepower loss. That’s why matching the correct spring to the engine is critical. Ideally, the spring should have just enough tension to work at maximum rpm (plus a little more, just in case), but not so much that horsepower and cam life are threatened. Above all, always use the springs that the camshaft manufacturer recommends for your cam
My point was that you don't have to sacrifice anything if you correctly match the springs to the cam being used. Sounds like my posts might be worth reading after all...
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