What’s the difference between these two LS3 blocks?
Thread Starter
Instructor
Joined: Jun 2013
Posts: 128
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From: Pinellas Park FL
What’s the difference between these two LS3 blocks?
i was looking for a bare LS3 block and came across two part numbers that are different prices.
anyone know the difference?
12623967 and 12673475
anyone know the difference?
12623967 and 12673475
Race Director
Joined: Sep 2007
Posts: 16,557
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From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
The 12673475 is the replacement for the 12623967. I see the 12673475 at $1900, but can't find pricing on the other.
Don't quote me on this, but I believe the --67 block was the LS3 in '08 only and the --75 block was '09-'13. I vaguely remember when the '09's were introduced that the LS3 block got some of the updates/changes that were used on the ZR1 block. The stiffening webs was one that comes to mind. BTW, the Summit site shows the --67 block as NLA.
Don't quote me on this, but I believe the --67 block was the LS3 in '08 only and the --75 block was '09-'13. I vaguely remember when the '09's were introduced that the LS3 block got some of the updates/changes that were used on the ZR1 block. The stiffening webs was one that comes to mind. BTW, the Summit site shows the --67 block as NLA.
Thread Starter
Instructor
Joined: Jun 2013
Posts: 128
Likes: 16
From: Pinellas Park FL
Yeah I’ve found the -67 for $1700 in a few places. But I think you’re right about the webbing. There seems to have been a couple revisions from what I’ve found and all leads back to strengthening. So in the end $200 is cheap insurance.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,104
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I suspect the '09+ LS3 blocks used the same casting, but added the valve management popups. That's a simple way to utilize a casting mold rather than having two whole separate molds. The LS3 block main caps are forged powdered metal in keeping with the same material used with the cracked rod technology on the connecting rods.
