Upgraded Cam?

[powerjoke73]

I saw riff raff has .015 and .03 shims. Which size should I go with?

 

[Gearhead]

the shims are determined by how much you need to get back to stock installed height and how much lift the cam has. My stage 1 cam has more lift than stock, so you really can't shim the 910s any tighter than .030 less than stock installed height or you will fatigue the springs prematurely or you can get too aggressive and coil bind them and have really bad things happen. You really don't want to approach coil bind even if there is room to do so because you will prematurely fatigue the spring and it will start losing pressure in a few thousand miles.

 

[powerjoke73]

I am kind of a newbie with this stuff. Why would I want the springs tighter? Or why would I want them looser?

 

[79jasper]

Tighter because valve float.
No one specific shim size will be perfect. You need the tools to measure them during installation.

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[powerjoke73]

I decided to go with a colt stage 2 cam. Just so happened a member had one sitting on the shelf they were willing to sell. I also ordered both sizes of shims so that we can figure out which ones we want to go with when we assemble.

 

[C'roy78stroker]

If Mr brenton doesn't mind keeping us posted on his progress either here or in another thread I'm sure it would be appreciated by more people then just myself...

 

[sideactiondiesel]

If Mr brenton doesn't mind keeping us posted on his progress either here or in another thread I'm sure it would be appreciated by more people then just myself...

Oh I will ! A lot happening this year and hard to keep everything strait lol 7.3/6.0/6.4/6.7 There is lots going on lol

 

[PsdPullerJr]

How are the cams coming for ported heads?

 

[sideactiondiesel]

How are the cams coming for ported heads?

There is a few in the works but for now non in a running engine as of now. very soon tho

 

[m j]

I think you are beyond a shimmed 910.
how much seat pressure do you need to keep the valves where they need to be? I have beehives set for around 155# with pretty much the same setup as you and am worried.
you spemt a lot of money on the bottom end it would suck to smack an open valve with the piston

 

[Powerstroker7.3]

Yeah I would steer away from 910 with a different cam. I went with beehives as well


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[mtsnowrunner]

Just do the beehives and be done, trust me I know what 910 coilbind.. and bent pushrods with broken rockers looks like.

 

[powerjoke73]

As an update, I bought some competition valve springs from Irate. All parts are in so motor will be put together by the end of the month.