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GM LSX-L92 Small Bore Cylinder Heads

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Old 01-26-2009, 08:00 AM
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Cutting the crate motors is prob. a good idea it ties alot of money up in inventory. They could be planning on selling them on a made to order basis, but it's easier to sell a $700 set of heads than a $5000 motor.
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Old 01-26-2009, 11:23 AM
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Originally Posted by Transamthunder
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.
You also need to remember that the square port on these heads required moving the intake valve away from the exhaust. That's the reason for the offset intake rocker. This will put the intake valve closer to the cylinder wall, so even with the 2.0 valve it most likely will not fit the 5.3 bore.
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Old 01-27-2009, 12:19 AM
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Originally Posted by a98ws6
So these are already produced?
Not sure on the details and when they will be out. Here is a link. Talk to Shaun. Im sure he can help with any questions.

http://www.mastmotorsports.com/black...20Heads&id=102
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Old 01-27-2009, 06:27 AM
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I'm not asking about the Mast heads, these are GM heads.
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Old 01-28-2009, 09:37 PM
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Aaron those heads on the mast website look like what you were talking about, but they make no mention of being GM. They are square port.
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Old 01-28-2009, 09:44 PM
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Originally Posted by boostedgtp
Aaron those heads on the mast website look like what you were talking about, but they make no mention of being GM. They are square port.
Nope, the Mast have a 12 degree valve angle, the GM have a 15 degree valve angle. Different heads, I'm specifically asking about the GM heads in the first post.
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Old 01-28-2009, 10:55 PM
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I would like to see a 346 with slightly modded small bore L92s(kinda big intake runner imo), FAST 102, and the RIGHT cam profile and see what it does?
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Old 01-28-2009, 11:08 PM
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Originally Posted by JPH
I would like to see a 346 with slightly modded small bore L92s(kinda big intake runner imo), FAST 102, and the RIGHT cam profile and see what it does?
I agree the runners are very large for a 346, but I'm just looking for information at this point so I can start building the engine 'virtually' and see how it performs.

When I saw these heads, I was thinking exactly as you state above.
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Old 01-28-2009, 11:18 PM
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Originally Posted by 405HP_Z06
I agree the runners are very large for a 346, but I'm just looking for information at this point so I can start building the engine 'virtually' and see how it performs.

When I saw these heads, I was thinking exactly as you state above.
I would lighten the rotating assembly up if doing a new fresh combo imo.
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Old 01-29-2009, 05:16 PM
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Originally Posted by JPH
I would like to see a 346 with slightly modded small bore L92s(kinda big intake runner imo), FAST 102, and the RIGHT cam profile and see what it does?
Id like to see the same but with my 383!
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Old 02-03-2009, 01:32 PM
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any new info on these?
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Old 02-03-2009, 01:43 PM
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I have asked every where I know and I have got nowhere
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Old 02-03-2009, 01:48 PM
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i would just build a 4.00 bore motor instead of messing with these huge
runner small valve, heads. and go with regular l92's. imo
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Old 02-04-2009, 12:09 AM
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there has been rumors of these heads months back, subscribing and waiting for new info
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Old 02-12-2009, 07:12 PM
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Looking for a set of heads for a 383 right now. I was thinking of going with a set of TFS 215 but if these Mastmotorsports are coming out I think I rather have these instead.
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Old 02-12-2009, 07:51 PM
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You do know that mast motorsports has some and gm is coming out with some?
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Old 02-12-2009, 09:50 PM
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Originally Posted by LSX-PWR
Looking for a set of heads for a 383 right now. I was thinking of going with a set of TFS 215 but if these Mastmotorsports are coming out I think I rather have these instead.
The heads referenced in this thread are NOT Mast Motorsports!!!!!!!!!
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Old 02-13-2009, 10:11 AM
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Originally Posted by 405HP_Z06
The heads referenced in this thread are NOT Mast Motorsports!!!!!!!!!
I know this, thats why I was asking about the Mast heads. Sorry to hijack.
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Old 04-15-2009, 10:06 AM
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Anything new? I haven't seen anything in the mags yet. Usually they are pretty good about cheerleading for the latest thing out.
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Old 04-18-2009, 09:40 PM
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I have wondered, since the L92s first arrived, if you could cut a new valve seat and a 2.0 and 1.55 valve job into them. If they would work on a 3.90 inch bore even with the offset intake rocker. On a 346 this would probably be way overkill, but on a budget 383...

Bump for any new info.

Josh
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