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Old 11-16-2009, 09:19 PM   #1
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Anyone with L92 Heads please help??

I am wanting to put the L92 heads on my setup as it appears these are the best out there. My question is I have already upgraded valve springs, retainers, rods, etc. and want to know exactly what is needed to put these heads on. Are they a direct bolt up with stock gasket kit? Please let me know everything about this install from everyone who has done this. I am putting heads on and adding a ZEX NO2 kit to complete my setup. Thanks.
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Old 11-16-2009, 09:21 PM   #2
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You already have L92 heads.

LS3 is the car version 6.2 and the L92 is the truck version 6.2 - which is in fact the EXACT same engine as the car L99. Both the L92 and L99 are the VVT engines but in the trucks the AFM is turned off.

In fact in the 2010 Camaro the accessory drive assembly is the truck setup.

I ran the L92 (823 Castings) on my LS2 6.0 in a TBSS with a LPE cam.
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Old 11-16-2009, 09:23 PM   #3
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For added info I have many mods done already so this is just another step. Here is the link to what I have done so far. Input on the L92 heads would be great.
http://www.camaro5.com/forums/showthread.php?t=47298
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Old 11-16-2009, 11:01 PM   #4
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as he already said,, the l92 heads are the same castings used for the ls3 and l99 engines, they bolt onto all the 4.00" and larger bore lsx engines
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Old 11-16-2009, 11:08 PM   #5
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haha. when i was deciding on my motor swap, i considered doing an LQ9 with L92 heads & intake...

but then i considered the strength of my transmission & my budget & went with a stock 5.3 - with possible cam in the future
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Old 11-16-2009, 11:18 PM   #6
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Quote:
Originally Posted by zebra View Post
haha. when i was deciding on my motor swap, i considered doing an LQ9 with L92 heads & intake...

but then i considered the strength of my transmission & my budget & went with a stock 5.3 - with possible cam in the future
my brother has a lq9 with l92 heads in a malibu wagon, it runs mid 10's
i also had a 99 s10 with a junkyard lq9 and l92 heads that also ran mid 10's
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Old 11-16-2009, 11:38 PM   #7
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Go ahead and get ported l92 heads, just make sure to opt for the hollow valves. Doing this pretty much makes the heads a true ls3 ported head. just re sell the stock heads and the overall price will not be that bad, probably less than headers. Ported heads from a good shop will gain 30hp over stock heads. I hope you were not talking about the stock non ported l92 heads like the ones GMPP sells as those heads with the stock combustion chamber would make you lose power. Even a stock l92 head milled to the ls3 combustion chamber size would gain you nothing as like everyone has said it is the same head casting(basically the same head)
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Old 11-17-2009, 08:54 AM   #8
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Your best bet is just to get your 821 LS3 heads ported. They're very similar to the 823 L92 heads, but you have the better valves. We offer a cnc ported program for your factory heads that is very very affordable. Typically adds just over 20rwhp or more depending on other mods.

The price is also very very good! My 2010 M6 SS makes 495/460 with heads/cam

http://www.texas-speed.com/shop/item...=1066&catid=20
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Old 11-17-2009, 08:55 AM   #9
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Here's engine dyno before & after from porting our engine dyno LS3 before & after head porting!

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Old 11-17-2009, 09:54 AM   #10
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Mast Motorsports
LS3 12Deg Med Bore Heads
Worth the extra Cash IMO .
They are part of our NA Stage 2 for a reason [ we tried some cnc'd stock heads hollow valves and with the same cam they picked up no more then 15 whp ] .
We gained 40whpall over the graph just a head swap only . Dropped 4 tenths and picked up 5 mph in the 1/4 ...
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Old 11-17-2009, 09:56 AM   #11
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Thanks guys. Jason I ordered my cam and all the valve upgrades from you guys. You say you have a program but is that set for everyone or does it matter that I have all these mods and can the heads be done for max performance? This is what I will do as it makes most sense money wise. How long is turn around time and what kind of pricing am I looking at?
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Old 11-17-2009, 06:11 PM   #12
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We have exchange LS3 heads so we can ship & you can ship your cores back. This will keep wait time to a minimum! The Mast heads look to be very nice as well, but what we're talking about is $2800 heads vs. $650 heads. We typically see something around mid 20s in hp gains from cnc porting the heads. What camshaft did you get?
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Old 11-17-2009, 08:30 PM   #13
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The cam shaft that you all recommended was Comp Cams 220/228 .581"/.588" 114LSA+3 for a supercharger setup. I would like to know where this cam stands as far being aggressive with max HP output. I am trying to dial the car to the track more than the street useability. If there is a better cam setup you would recommend, I would like to check this option out also. I am definitely going to do the heads. Here is what else you put together for me:
Precison Race Components 650 Lift Spring Kit w/Titanium retainers, seats and seals. Texas-Speed 7.40 Chromemoly Pushrod. Shimmed and ported LS6 Oil Pump. N-Motion Double roller LS2 timing set4x cam gear. ARP camshaft bolt kit. Let me know if this will cover everything with new heads and your opinion on the cam.
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Old 11-18-2009, 10:32 AM   #14
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You can add some extra duration, but it could cost you some boost. I think your looking good with the combination you have so far. I can get you cnc porting on your cores & assemble the heads with that spring kit if you ship them back!
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