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LS3 Hollow Stem Intake Valve PN?

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Old Apr 5, 2008 | 07:23 PM
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Default LS3 Hollow Stem Intake Valve PN?
Title says it all.

I have been looking around on the web for sometime and cannot find it.
I thought someone here would have it for sure.

Thanks in advance.

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Old Apr 5, 2008 | 08:43 PM
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Same as the ls7, I do believe.... Intake 12591644 Exhaust 12578455. There the same size as the L92
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Old Apr 5, 2008 | 08:46 PM
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Originally Posted by thechad
Same as the ls7, I do believe.... Intake 12591644 Exhaust 12578455. There the same size as the L92
Hmmm.. Pretty sure that LS7 intake valve is Titanium?

The list price on them is $156 each.
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Old Apr 5, 2008 | 11:01 PM
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12569427 2.165" 8mm Stock replacement hollow stem valve used in LS3 engines
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Old Apr 6, 2008 | 12:16 AM
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12578455=$37.86 (SDPC)
12591644=$113.70

($37.86 x 8) + ($113.70 x 8) = $1212.48 for valves

What advantage do these hold over say the solid L92 valves?
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Old Apr 6, 2008 | 07:21 AM
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Originally Posted by subtlez28
12578455=$37.86 (SDPC)
12591644=$113.70

($37.86 x 8) + ($113.70 x 8) = $1212.48 for valves

What advantage do these hold over say the solid L92 valves?
Lighter valve is easier to control at higher RPM.

Dam I really thought they were the same as others. Good to know there not.
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Old Apr 6, 2008 | 10:41 PM
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Originally Posted by subtlez28
12578455=$37.86 (SDPC)
12591644=$113.70

($37.86 x 8) + ($113.70 x 8) = $1212.48 for valves

What advantage do these hold over say the solid L92 valves?
The LS7 valves are 2.20", compared to 2.16" for the L92/LS3 valves.

Andrew
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Old Apr 7, 2008 | 03:46 PM
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Manley just came out with L92 valve (hollow intakes) with procut stems. Save money use them from SDPC.
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Old Apr 8, 2008 | 03:53 PM
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here's some: http://cgi.ebay.com/ebaymotors/GM-LS...QQcmdZViewItem
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Old Jul 4, 2008 | 09:07 PM
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Originally Posted by Blindmelon
Manley just came out with L92 valve (hollow intakes) with procut stems. Save money use them from SDPC.
What is the part numbers on these? I can not find 'em...
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Old Jul 5, 2008 | 08:02 AM
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Originally Posted by rickou812
What is the part numbers on these? I can not find 'em...
The Manley Part numbers for the Hollow Stem Intake vavles are 11620H
I ended up with two sets of them from the last build I have so I have one extra set. They are $460 retail, I will take $350 for them shipped, or if you want exhaust valves too, i will take $460 for an entire set.

The sets I have are new in the box.

Nick
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