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GM Small Blocks: LS9 & LSA

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Old 10-29-2009, 05:48 PM
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Default GM Small Blocks: LS9 & LSA

These are two pretty stout small blocks. Is there a marine version of either of these engines.

The Generation IV LS9 is 376 cu.in, 9.1:1 pistons, 638 hp (ZR1 motor)

The LSA is the same just detuned. 556 hp (CTS-V motor)

What would be the cost if there is a marinized version? Nice stuff.

Last edited by Smarty; 10-29-2009 at 06:00 PM.
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Old 10-29-2009, 05:58 PM
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Small blocks are great , I have the 6.2 MX [ 377 ] blocks and happy with it.
The LSA would be my choice if I built a project .http://www.gm.com/experience/technol...LS3_Marine.pdf

You could also get these from Kodiak engineering for a few years now http://www.kemequipment.com/superchargedvortec6000.html

Last edited by spectras only; 10-29-2009 at 06:00 PM.
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Old 10-29-2009, 06:00 PM
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Is there a marine version of either of these engines.
Yes there is. Ray from Raylar posts here so hopefully he can add some info to this thread.

http://www.raylarengine.com/550_engine.html
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Old 10-29-2009, 06:06 PM
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Yes there is. Ray from Raylar posts here so hopefully he can add some info to this thread.

http://www.raylarengine.com/550_engine.html
Which LS block is that based off of, the Gen IV LS7?
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Old 10-30-2009, 12:15 AM
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Which LS block is that based off of, the Gen IV LS7?
I don't know. Where is Ray when you need him?

I suggest you just give Raylar a call or an email. I'm sure they'd be happy to walk you through the specifics of that engine.
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Old 10-30-2009, 11:07 AM
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go to the skater forum under new LS7 30 SKATER IN THE SPRAY BOOTH
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Old 10-31-2009, 04:05 PM
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Both of those engines are based on a GEN IV LS 6.2 block. The LS7 is a 7.0
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Old 11-01-2009, 01:13 PM
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The LS9 S/C is making more than 133 hp compared to the LS7 with 51 less cu.in. and 9.1:1 pistons. The LS7 N/A has 11.1:1 pistons (505 hp). The Eaton blower seems to make the LS9 a nice engine.

Back to my original question on cost of LS9 in a marine application, is it available, cost? The LS7 does seem like the way to go.

Last edited by Smarty; 11-01-2009 at 09:22 PM. Reason: added hp
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Old 11-01-2009, 06:14 PM
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The LSA makes 540 hp 540 tq.

http://www.marinepowerusa.com/Produc...MarineBase.pdf

I was supposed to get a pair of these for my 29 Baja last winter. The deal fell through.
I think it would have been a cool project. The swap would have lost me 1000 lbs out of the butt of my boat.
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Old 11-01-2009, 07:23 PM
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The LSA makes 540 hp 540 tq.

http://www.marinepowerusa.com/Produc...MarineBase.pdf

I was supposed to get a pair of these for my 29 Baja last winter. The deal fell through.
I think it would have been a cool project. The swap would have lost me 1000 lbs out of the butt of my boat.
Looks good, how much were they asking? Headers included? Headers and reversion issues due to agressive (or mild) camshaft ?

I realize I have lots of questions, but I would think if the motor is marinized, then, with the headers in the market place for this motor that the cam shaft profile would be taken in account. I am not well versed in small aftermarket exhaust on this block design though I have been following the SBC thread for older style small blocks (exhaust location differs).

Last edited by Smarty; 11-01-2009 at 11:55 PM.
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