CK5
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Big block guys
- Thread starter 85 Jimmy
- Start date
Alright, it's time to get the head work done. Which valve springs should I go with? My cam says I can use either these http://www.compperformancegroupstor...Store_Code=CC&Screen=PROD&Product_Code=924-16 or these http://www.compperformancegroupstor...Store_Code=CC&Screen=PROD&Product_Code=930-16
Have you looked into beehive valve springs? They allow you to run a little less spring pressure (lighter retainers) and control the harmonics better, making more hp and torque up top. I've seen a few dino tests where the power increase was impressive, for such a simple change.
Hoss7979
1/2 ton status
The spring pressure is different as well besides the ID/OD
924-16.....347lbs
930-16.....357lbs
Hoss7979
1/2 ton status
Have you mocked up what your spring height is gonna be yet or have had it done by the machine shop? To see if there's gonna need any shimming, that'll help determine what pressure you'll need.
I haven't touched the heads yet. Both of those springs say the heads have to machined for them to fit. I wanted to get everything for the heads before bringing them to the machine shop, so I can just drop everything off at the same time.
How do I mock up for spring height? Guess I can try to find some YouTube videos.
How do I mock up for spring height? Guess I can try to find some YouTube videos.
Hoss7979
1/2 ton status
Easiest way to explain it.....
http://www.onallcylinders.com/2013/...lled-height-what-it-is-and-how-to-measure-it/
http://www.onallcylinders.com/2013/...lled-height-what-it-is-and-how-to-measure-it/
http://www.superchevy.com/how-to/corp-0509-beehive-cylindrical-valvespring-info/
This is one of the articles I've read on the beehive springs. I'd give comp cams a call and see what they say. They may have reason for or against using them. If you can use them, they can be installed with no machining to the head, in some applications.
This is one of the articles I've read on the beehive springs. I'd give comp cams a call and see what they say. They may have reason for or against using them. If you can use them, they can be installed with no machining to the head, in some applications.
If I went with a beehive spring, would I have to run a lighter spring during break in?
According to comp, I need to remove the inner spring on the 924 or 930 during break in. Then re-install the inner spring after break in.
According to comp, I need to remove the inner spring on the 924 or 930 during break in. Then re-install the inner spring after break in.
Lighter springs are always recommended. Personally I have never used them myself, but I'm stupid and apparently pretty lucky. In the last 5 years I've done 4 cam swaps with flat tappets and no issues.
Again I'd talk to comp cams and see what they recommend. They may tell you to run the stock springs for break in, as long as they can handle the lift.
Again I'd talk to comp cams and see what they recommend. They may tell you to run the stock springs for break in, as long as they can handle the lift.
roller.....
Hoss7979
1/2 ton status
Until the valves float......
We're talking about lighter springs for cam break-in.
roller.....
FTW
Hoss7979
1/2 ton status
We always break them in like we're gonna run them! Never had an issue doing it that way.....
Just an update on this thing. The heads are at the machine shop. When I talked to the guys over there they said the best thing to do would be to just do a basic valve job and then set them up with the new springs and seals. They said if I were to do anything else like put big valves in them, I may as well just get aluminum heads b/c they'd end up only being a little more in price.
Another thing, this won't be going in the blazer anymore... I just picked up a 67 chevelle and it'll find its way into that. The down side to the chevelle is that it's a 4 door, but I like the 4 doors, so no big deal to me.
Another thing, this won't be going in the blazer anymore... I just picked up a 67 chevelle and it'll find its way into that. The down side to the chevelle is that it's a 4 door, but I like the 4 doors, so no big deal to me.
