LS2 block machining
Thread Starter
Le Mans Master
Joined: Mar 2008
Posts: 9,779
Likes: 18
From: King City Ontario
LS2 block machining
I was at a gas station yesterday and a GM Canada machinist who was filling up said he liked my 07 LMB corvette 
. (I (should be GM) get frequent compliments on the colour). He said he works in St. Catharines, Ont. on the line machining the LS2 blocks. Some points:
Gary
. (I (should be GM) get frequent compliments on the colour). He said he works in St. Catharines, Ont. on the line machining the LS2 blocks. Some points:- The blocks are cast in Mexico and trucked to the plant
- The LS2 block is set up on the line and every machining operation from line boring to honing is done.
- Every 3rd block is 100% dimensionally checked including every thread depth, diameter, bore, deck, etc.
- The LS3 block is machined in Germany where they have a jig for each one to squeeze it to maintain its shape during honing and line boring
- The LS2 and LS3 blocks are now having aluminium cam bushings installed as they stand up better than babbit.
- He did not know where the heads were done.
Gary
Thread Starter
Le Mans Master
Joined: Mar 2008
Posts: 9,779
Likes: 18
From: King City Ontario
The jig would essential restrict any elastic deformation caused by the positioning and cutting tooling pressing against the block as it cuts. There is obviously minor elastic deformation when you apply a cutting head. To maintain tight tolerances, this is necessary I guess. When the block is released, there is no change in the bores, etc., due to spring-back. The block is more or less "supported by" the jig.
Safety Car
Joined: Feb 2007
Posts: 4,684
Likes: 107
From: Opelika Alabama
The jig would essential restrict any elastic deformation caused by the positioning and cutting tooling pressing against the block as it cuts. There is obviously minor elastic deformation when you apply a cutting head. To maintain tight tolerances, this is necessary I guess. When the block is released, there is no change in the bores, etc., due to spring-back. The block is more or less "supported by" the jig.
but I doubt that the LS2 is not put in a "jig" too I'm sure they don't just throw it on a table and go at it, he make's it sound like only the LS3 gets the"jig"
