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LS2-L76 small block compatibility

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Old Jun 12, 2017 | 01:15 PM
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Default LS2-L76 small block compatibility

I have a 2007 Chevy Silverado with the Vortex Max 6.0 Liter. I have a cracked block. I'm looking for a replacement block but all I can find is the LS2 block with part number 12602691. My motor is the L76. Is the L76 short block the same as the LS2 short block? The description says it is a direct replacement for 2005-2008 LS2 Corvette, SSR, GTO 6.0L and TrailBlazer SS but says nothing about a Silverado.

Thanks in advance for any info you can give me!
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Old Jun 12, 2017 | 01:58 PM
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The block itself is but pistons are diff. The l76 had valve reliefs.
Your l76 has active fuel management (afm/dod) and vvt variable valve timing, which is why they have notches/valve reliefs on the pistons.
Using an ls2 shortblock would only work if you removed vvt, otherwise youd have to flycut the pistons. You can retain the afm with the ls2 short block, but its better and cheaper to delete that as well.
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Old Jun 12, 2017 | 03:15 PM
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Originally Posted by tech@WS6store
The block itself is but pistons are diff. The l76 had valve reliefs.
Your l76 has active fuel management (afm/dod) and vvt variable valve timing, which is why they have notches/valve reliefs on the pistons.
Using an ls2 shortblock would only work if you removed vvt, otherwise youd have to flycut the pistons. You can retain the afm with the ls2 short block, but its better and cheaper to delete that as well.

My intention was to get a bare block and swap everything over to it. Will my pistons in my current block transfer over to the new block?
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Old Jun 12, 2017 | 03:17 PM
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Yes but i would highly recommend new rings. thats all
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Old Jun 12, 2017 | 03:54 PM
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Originally Posted by tech@WS6store
Yes but i would highly recommend new rings. thats all
Yes, I was going to put new rings, new bearings and new timing chain and get a valve job done on the cylinder heads before putting it back together.
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Old Jun 12, 2017 | 04:07 PM
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That is it!

For reference on the parts, we can get you the ls2 chain, rings, crank and rod bearings and a hi flo oil pump for $295 shipped.
Those rings are and odd size so you cant just throw a 1.5/1.5/3.0 ring set in em.
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Old Jun 13, 2017 | 01:07 PM
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If you don't mind iron go with a LY6 block much cheaper. The G8 GT L76 had AFM but no VVT
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Old Jun 13, 2017 | 02:30 PM
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The only ls gm car that got vvt was the l99 afaik. Barring fwd cars...if any of those as well.
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Old Jul 10, 2017 | 02:23 PM
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Originally Posted by tech@WS6store
That is it!

For reference on the parts, we can get you the ls2 chain, rings, crank and rod bearings and a hi flo oil pump for $295 shipped.
Those rings are and odd size so you cant just throw a 1.5/1.5/3.0 ring set in em.
What size are the rings?

Send me a link so I can check out your stuff.
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Old Jul 10, 2017 | 02:40 PM
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1.2/1.5/2.5 rings

Email me (its easier to link amd track) and ill get you info

Rpmspeedtech@gmail.com
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