Shrouded Valve? Picture? - Team Camaro Tech
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post #1 of 7 (permalink) Old Jan 16th, 10, 10:20 AM Thread Starter
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Mark
 
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Shrouded Valve? Picture?

Im not really sure I understand the Shrouded Valve concept, but need to understand it so that I can correct it on my current build. I have bolted a #215 heads to my new block so that I could look up into the Cylinder head, but fail to see the valve Shrouded.
Any help is appreciated.

1967 RS/SS 396 4 Speed (All Stock)

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post #2 of 7 (permalink) Old Jan 16th, 10, 01:14 PM
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Wink Re: Shrouded Valve? Picture?

Quote:
Originally Posted by Journey View Post
Im not really sure I understand the Shrouded Valve concept ...
"Shrouding" is when the outer edge of the valve is to close to the chamber wall to allow the valve to flow to it's potential.
'Un-shrouding' the valve allows the charge to flow unimpeded (or as unimpeded as possible) into the cylinder. This gives you the maximum VE (volumetric efficiency) for each cylinder cycle.
Many smaller valve equiped GM heads can have larger valves installed ... but doing so without paying attention to the valve efficiency will not net you the gains you may be seeking.


Read here for more info - http://www.diyporting.com/Shrouding.html

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post #3 of 7 (permalink) Old Jan 16th, 10, 01:42 PM
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Re: Shrouded Valve? Picture?

Typically, unshrouding the valves involves grinding the chamber wall back to near the bore/gasket. I've seen some, big block mostly, where the top on the cylinder has a notch ground in it to unshroud the valve further.





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post #4 of 7 (permalink) Old Jan 16th, 10, 01:58 PM Thread Starter
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Re: Shrouded Valve? Picture?

A 396 block has that notch in the top of the block on one side, are you saying it needs to be there for both Valves?
Also, My block is being bored .060 over, and with the 454 crank, makes it a 434 CI.

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post #5 of 7 (permalink) Old Jan 16th, 10, 02:01 PM Thread Starter
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Re: Shrouded Valve? Picture?

Great artical, now I understand a little more.
Is the problem with the EX, IN, or both?

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post #6 of 7 (permalink) Old Jan 16th, 10, 03:36 PM
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Re: Shrouded Valve? Picture?

Quote:
Originally Posted by Journey View Post
Great artical, now I understand a little more.
Is the problem with the EX, IN, or both?
Normally intake . Its the largest od valve head.

Don
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post #7 of 7 (permalink) Old Jan 16th, 10, 05:57 PM
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Re: Shrouded Valve? Picture?

there are 2 ways to unshroud the intake valve. 1 offset bore the block. 2 use offset dowel pins. with the offset dowel pins you must oblong the bolt holes in the heads and intake. This is not something you really need to do for a street motor. it's super stock and stock elem type of things we do

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