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GM LSX-L92 Small Bore Cylinder Heads

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Old 01-24-2009, 11:14 PM
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Default GM LSX-L92 Small Bore Cylinder Heads

I saw these in the 2009 GMPP catalog, but I haven't heard nor seen anything about them. Does anyone know anything about them?


19201807 NEW
LSX-L92 Small Bore Cylinder Head (not shown)
• L92 style rectangle port design
• Assembled with 2.00" intake and 1.55" exhaust valves
• 15° valve angle
• Minimum 3.89" bore
• 250cc "as-cast" intake ports, 80cc "as-cast" exhaust ports
• 65cc "as-cast" combustion chambers
• Responds well to larger valves
Old 01-25-2009, 09:40 AM
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Isnt that intake port a little large for a 2.00" valve though? I'm interested in this too.
Old 01-25-2009, 10:00 AM
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I guess the L76/LS3 Intake is what will only go with these..
Old 01-25-2009, 10:01 AM
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Or the GMMP single plane carb style intake
Old 01-25-2009, 10:11 AM
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Whats the cost ?
Old 01-25-2009, 10:14 AM
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Originally Posted by the_merv
I guess the L76/LS3 Intake is what will only go with these..
or the new fast 102MM
Old 01-25-2009, 11:29 AM
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^^Is that out yet?
Old 01-25-2009, 11:39 AM
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Was their a price listed on these?
Old 01-25-2009, 12:04 PM
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I haven't seen any pricing.
Old 01-25-2009, 12:36 PM
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that sounds like a good head
Old 01-25-2009, 12:42 PM
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I am interested as long as pricing is in line with the originals
Old 01-25-2009, 12:46 PM
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Originally Posted by Bcar
I am interested as long as pricing is in line with the originals
I agree they seem to be similar in port size to the cathedral port GM CNC heads but since they are as cast the price should be way down.
Old 01-25-2009, 12:56 PM
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Aren't the originals like $350 ea? I was hoping GMPP would step up with something like this for the small bore guys.
Old 01-25-2009, 01:41 PM
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That would be cool if SDPC could chime in for price info and release date ...killer product for LS1 guys if you ask me!!
Old 01-25-2009, 05:58 PM
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Check out Mast Motorsports they have a set of small bore L92 heads. They outflow the AFR 205s.
Old 01-25-2009, 06:34 PM
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I heard GMPP is stopping the crate motor program what with the recent
crisis and all. Wouldn't be surprised if these were victims too.
Where is the aluminum LSX block?
Old 01-25-2009, 06:37 PM
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^ If we're looking at the same thing those are a completely different part. They say in the ad that they are a 12 degree casting. In the first post it says the GM ones are 15 degree.

These seem like a nice piece. Hopefully, they are priced competitevely as the larger bore setups. These would be a nice combo with the ZR1 blower setup that is coming out.
Old 01-25-2009, 08:24 PM
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Originally Posted by Quick 68
Check out Mast Motorsports they have a set of small bore L92 heads. They outflow the AFR 205s.
So these are already produced?
Old 01-25-2009, 08:44 PM
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Well I was kinda excited about possibly putting these heads on my 5.3, but the bore is only 3.779. Maybe you still use them since quite a few people have used the 205 Mongoose AFRs on their motors. I am really hoping someone buys these to try this combo out, even though they might be rediculously huge for such a small motor.
Old 01-25-2009, 08:51 PM
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Well I was kinda excited about possibly putting these heads on my 5.3, but the bore is only 3.779. Maybe you still use them since quite a few people have used the 205 Mongoose AFRs on their motors. I am really hoping someone buys these to try this combo out, even though they might be rediculously huge for such a small motor.


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