Guys running Kibblewhites...

[flyboy1294]

Hey guys,
I'm ordering +1mm Kibblewhite valves for my ex build on Monday and I have a question.

I was intending to order from CT racing. At $30 a valve, I can't beat the price. However, in the footnotes, they say the valves require after market springs. They offer no justification for this.

The only thing I can figure is that Kibblewhites are heavier than the stock? However, I cannot confirm this. Titanium based springs are an additional $170. So before I dish out the extra money, I figured I would ask if anyone on here has Kibblewhite vavles, and if you used the springs or not?

Thanks in advance

[flyboy1294]

Anyone? I'll try to call CT tomorrow, but I doubt I'll be home in time. I'd appreciate any input before I ask a potentially stupid question.

[gray]

ct just did my head i got the same valve put in u will need shorter valve guides put in as well as a valve job.

[flyboy1294]

I'm sending the top of the engine off to be p&p'd along with all of that stuff. I am relatively certain the guy doing the work is aware of the shortened valve guides, but I'll double check.

Do you know if they installed the springs I mentioned on your build?

[rob_990]

when i rebuilt mine i put in kibble white valves and springs

[SLABORDE]

BE SURE TO GET THE RELIEF ON YOUR PISTON CUT ALSO, IF NOT THE VALVES WILL HIT THE PISTON

[-TheDude-]

you have to run their springs with their valves

[flyboy1294]

I called CT racing earlier this week and talked to them.

Here is a direct quote:
"You only need springs if your going to use a high lift cam. So the cam is the only thing that will dictate what you need for springs. Stock springs are the only way to go on the 400, unless you get the rockers hardfaced."

A Stage 3 Hotcam is not considdered high-lift. Stock springs are better to use on it specifically.

I will leave this up for future reference of anyone that has a question about installing valves. Thanks for the help

[-TheDude-]

when i did the rebuild on my motor and i wanted to use kibble white valves, but not the springs. I CALLED KIBBLE WHITE THEMSELVES. and they told me you MUST use their springs

[flyboy1294]

Originally posted by -TheDude-
when i did the rebuild on my motor and i wanted to use kibble white valves, but not the springs. I CALLED KIBBLE WHITE THEMSELVES. and they told me you MUST use their springs

That's definitely interesting. Like I posted earlier, the only reason the springs would need to be changed is that the valves were heavier than stock, don't you agree?

The guy from CT weighed them and said they were actually a few grams lighter than stock.

Regardless, I already have the parts on their way, so we'll see if it works. lol

[sc400ex_rider]

i dont recommend using stock springs on any high lift cam. the stock springs wont last forever. thats why 400ex heads go for 2 bills on ebay.......

[flyboy1294]

A Stage 3 Hotcam is more gentle on the engine than the Stage 1 that I am currently using. I do not think that it is high enough lift to cause me any issues. As I said, we will see.

[-TheDude-]

Originally posted by flyboy1294
That's definitely interesting. Like I posted earlier, the only reason the springs would need to be changed is that the valves were heavier than stock, don't you agree?

The guy from CT weighed them and said they were actually a few grams lighter than stock.

Regardless, I already have the parts on their way, so we'll see if it works. lol
i do agree with you but thats not what the tech at kibble white told me

[flyboy1294]

Originally posted by -TheDude-
i do agree with you but thats not what the tech at kibble white told me

Did he give a reason for running their springs?

[-TheDude-]

Originally posted by flyboy1294
Did he give a reason for running their springs?
no i was gonna get a great deal on the valves, but didnt want to use their springs, but a buddy told me to call cuz he thought u had to use their springs. i called and asked if i could use stock or another spring and he said no u have to use theirs so i went with wiseco valves

[flyboy1294]

Were the Weisco valves oversized? Or were they the same spec as stock?

[-TheDude-]

Originally posted by flyboy1294
Were the Weisco valves oversized? Or were they the same spec as stock?
same as stock

[flyboy1294]

Originally posted by -TheDude-
same as stock
Alright, I might look into that

[05440EX]

Sounds to me like they are just trying to make more money off of unsuspecting folks! There is absolutely no reason to use a specific spring with a valve unless that valve is substaintally heavier than the OE piece. There isn't really even any reason to change the guides of course unless yours are worn.

And I must say I'm not up to par on the hotcams but can somebody explain to me how the "stage 3" cam is less aggressive than the stage 1??? I call BS on that one...

Stage 1-


Intake lift (mm): 9.00
Intake lobe center (degrees): 106.00
Intake duration (degrees at 1mm): 246.00
Intake valve lash (mm): 0.13

Exhaust lift (mm): 9.00
Exhaust lobe center (degrees): 107.00
Exhaust duration (degrees at 1mm): 246.00
Exhaust valve lash (mm): 0.15


Stage 3-


Intake lift (mm): 9.10
Intake lobe center (degrees): 110.50
Intake duration (degrees at 1mm): 262.00
Intake valve lash (mm): 0.13

Exhaust lift (mm): 9.00
Exhaust lobe center (degrees): 104.50
Exhaust duration (degrees at 1mm): 257.00
Exhaust valve lash (mm): 0.15

[flyboy1294]

Originally posted by 05440EX
Sounds to me like they are just trying to make more money off of unsuspecting folks! There is absolutely no reason to use a specific spring with a valve unless that valve is substaintally heavier than the OE piece. There isn't really even any reason to change the guides of course unless yours are worn.

And I must say I'm not up to par on the hotcams but can somebody explain to me how the "stage 3" cam is less aggressive than the stage 1??? I call BS on that one...

Stage 1-


Intake lift (mm): 9.00
Intake lobe center (degrees): 106.00
Intake duration (degrees at 1mm): 246.00
Intake valve lash (mm): 0.13

Exhaust lift (mm): 9.00
Exhaust lobe center (degrees): 107.00
Exhaust duration (degrees at 1mm): 246.00
Exhaust valve lash (mm): 0.15


Stage 3-


Intake lift (mm): 9.10
Intake lobe center (degrees): 110.50
Intake duration (degrees at 1mm): 262.00
Intake valve lash (mm): 0.13

Exhaust lift (mm): 9.00
Exhaust lobe center (degrees): 104.50
Exhaust duration (degrees at 1mm): 257.00
Exhaust valve lash (mm): 0.15

Less Aggressive might not be a good word choice on my part, but because a Stage 3 changes the valve duration, it actually lowers your dynamic compression ratio as compared to a stage 1. So in a way it's easier on the valve train. Atleast, that is how I understood it.