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Old 05-07-2012, 12:27 PM
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Vortec Head lift upgrade?

The new Comp Cam I am considering requires about a 0.50" lift so I will need to upgrade the lift capabilities on my 906 Vortec heads. I've been looking at the COMP Cams #26915 Beehive spring kit with appropriate retainers and locks. Documentation doesn't say anything about needing machine work or needing to enlarge the pushrod holes or add pushrod retainer plates as I have seen many others do. I plan to reuse the factory self aligning rockers. At what point does it become necessary to drill out the holes and/or add the guide plates?

Here's a link to my entire engine build thread if you are interested:
My 350 Vortec Engine Build

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Old 05-07-2012, 02:57 PM
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What cam? Depending on the article you read, they will tell you that stock Vortecs will handle .450"-.480" lift safely. But you HAVE to measure this yourself since there is variance in the heads.

You need to have at least.030" between the valve retainer and valve guide under full lift. You also need to have at least .030" between each spring coil under full lift.

If you plan to use the positive type oil seals you have to grind the guides to accept these to fit. These are the best types of seals to use. If you use the o-ring or umbrella type seals, then you don't have to do this.

Vortec wiki
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Old 05-07-2012, 06:31 PM
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You don't have to do a thing to install the beehive springs but follow the instructions.
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Old 05-07-2012, 06:36 PM
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Quote:
Originally Posted by cool rockin daddy
You don't have to do a thing to install the beehive springs but follow the instructions.
Thank you. That is exactly the answer I was hoping for.
I've spent some time this afternoon researching this and was getting close to the same conclusion.

I appreciate your wisdom and input.
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Old 05-07-2012, 07:09 PM
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Alex's Parts has vortec highlift valve spring kits for $89.50.
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Old 05-07-2012, 08:19 PM
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The stock ~7/16" holes where the p-rods pass through a Vortec head don't need enlarging unless they are found to be too close, usually because of a rocker ratio change. They should still be checked for clearance along w/everything else. If the holes need opened up, they're usually drilled out to 1/2".

Don't use guide plates if you use self aligning rockers. One or the other- never both.

Last edited by cobalt327; 05-07-2012 at 08:27 PM.
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