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Biggest valve for a 4in bore???

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Old Aug 30, 2006 | 11:54 PM
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Default Biggest valve for a 4in bore???

will 2.150 and 1.610's fit in a 4in bore? I know they will clear a 4.060 i'm just not sure about a 4in..
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Old Aug 31, 2006 | 01:24 PM
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Those size valves may fit becuase ET heads runs a 2.125/1.60 combo in their 4.00" bore LS7 head, but you may encounter a problem with shrouding the valve to much on the outside or the valves beind to close to each other on the inside, which both hurt flow.
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Old Aug 31, 2006 | 01:52 PM
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Depends on the valve placement in the head castings.

What castings?

Bret
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Old Aug 31, 2006 | 01:59 PM
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Originally Posted by SStrokerAce
Depends on the valve placement in the head castings.

What castings?

Bret
say like the L92 heads from Gm....with the 2.16 valve...
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Old Aug 31, 2006 | 07:10 PM
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They fit, Holden has a LS2 block with L92 heads, that's where we get the L76 intakes from.

Bret
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Old Aug 31, 2006 | 08:27 PM
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there in a allpro head..
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Old Sep 1, 2006 | 05:57 AM
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Is it the LS7 style All Pro head or the other All Pro head? The valve spacing in the LS7/L92 stuff will allow it to fit, I don't think a standard Gen III head will. Only way is to put one in there and check.

Bret
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Old Sep 1, 2006 | 08:24 AM
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Hey Bret. How's it going?
I'm getting real close to finishing up several port programs for the All Pro LSW 12º head. The small bore program (4.0") is designed around 2.150"/1.600" valve sizes. I don't see a larger valve than this giving a flow advantage for these bore sizes given the wedge chamber layout.

Cheers,

Richard
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Old Sep 1, 2006 | 09:35 AM
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Going well Richard.... I gotta give you a call sometime and catchup before we run into each other at PRI again.

Bret
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Old Sep 1, 2006 | 06:12 PM
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it's not a ls7 allpro..they are a raised runner head ported by HRD...
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