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Old 05-30-2013, 04:49 PM
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Spring height micrometer

This is my first build,I bought a comp cam 4929 spring height micrometer. I'm reading up on how to measure my stock valves on my 781 heads for my 454.
I plan on installing this k kit for my engine:
http://www.summitracing.com/parts/cca-k11-205-3

My heads are bare expect for factory exhaust rotators,one shim under intake, valves and guides.
I plan on using these locators and shims:
http://www.summitracing.com/parts/cca-4757

http://www.summitracing.com/parts/cca-4779-8

Now my valves are stock, I understand that I install the micrometer over the valve, install the retainer and keepers that are in the k kit. Bring the mike up till valve closes. What do I put under the mike?
Factory rotators or comp cam locators?
On the intake side do I use one shim?

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Old 05-30-2013, 05:42 PM
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Use rotator eliminators on the exhaust side. The rotators won't last in high performance use. I usually try to use a .015 shim on bare cast iron, as a wear shim. Most factory heads use the shim when assembled. You will find the spring height is short on these heads. (I JUST READ THE SPECS).That is a mild cam so the rotators will work if you can get the correct spring height. Any kind of high lift cam will require +.050 or +.100 retainers.

The rest is up to you. Shim untill you get the correct spring height. + or -.. Usually you can get within .010 or so.

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Old 05-30-2013, 05:46 PM
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Originally Posted by BOBCRMAN@aol.com View Post
Use rotator eliminators on the exhaust side. The rotators won't last in high performance use. I usually try to use a .015 shim on bare cast iron, as a wear shim. Most factory heads use the shim when assembled.

The rest is up to you. Shim untill you get the correct spring height. + or -.. Usually you can get within .010 or so.
where would I find the correct spring height?
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Old 05-30-2013, 05:51 PM
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where would I find the correct spring height?
Will be with the cam and/or springs. Or cam manufacturers catalog
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Old 05-30-2013, 06:00 PM
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Originally Posted by BOBCRMAN@aol.com View Post
Will be with the cam and/or springs. Or cam manufacturers catalog
Now I'll take a guess and say I'm aiming for seated load(both intake and exhaust valves closed)?

Here is the spring specs:
COMP Cams: Single Outer Valve Springs: 1.524" O.D., 1.110" I.D.
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Old 05-30-2013, 06:11 PM
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Shoot for 1.900. 122 lbs. That is plenty of pressure for mild hydraulic cam.

Actually I like closer to 110 lbs. Easier on break in and good to 5500 rpm.
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