LS1 crankshaft casting numbers??????
06-13-2010, 08:20 PM
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LS1 crankshaft casting numbers?????? I've posted this several places on this site, but I guess the info that I'm looking for is not available here. I'm just trying to fine out if I have a 99 LS1 4.8 or a 5.3 engine? My crankshaft number is 12552215 if someone know where to look this up.
Last edited by schartzracing; 06-14-2010 at 08:09 AM.
06-21-2010, 02:05 AM
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Not sure if i read the post correctly but an LS1 is a 5.7. If you have no clue what engine you have try looking and the numbers stamped on the heads and research that number and it should let you know what engine you have assuming it is stock.
06-21-2010, 02:29 AM
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Sorry to say, but if it's a 5.3 or 4.8 it's not an LS1 and I noticed from your other posts its an iron block. LS1's were all aluminum. According to a google search though 12552215 is the casting number for a 6.0 truck. If you pull the heads then measure the bore. If it's 4.0" or more then it's the 6.0.
https://ls1tech.com/forums/generatio...ck-please.html
https://ls1tech.com/forums/generatio...hine-shop.html
https://ls1tech.com/forums/generatio...ck-please.html
https://ls1tech.com/forums/generatio...hine-shop.html
06-21-2010, 03:53 PM
#4
^^^^I agree^^^^ From what I can see you have a 99-00 6.0 liter.
The full link to what I pasted below: http://www.enginebuildermag.com/Arti...all_block.aspx
The 6.0L shares the same 3.622? (92mm) stroke with the 5.3L and 5.7L, but there are two or three different cranks.
*
All of the '99 - '00 cranks had the 12552215 casting with the wide flange. This is the only application for a crank that has a 92mm stroke and a wide flange.
*
All of the '01-'04 cranks used the 12552216 casting with the narrow flange, just like the 5.3L and 5.7L, but the 6.0L pistons weighed considerably more (470 grams) than the ones used in the 5.3L and 5.7L engines, so the bobweights had to be different. These may even be two different versions of this crank because the rods used in the LQ9 motors weighed 36 grams more than the ones in the LQ4 motors.
The full link to what I pasted below: http://www.enginebuildermag.com/Arti...all_block.aspx
The 6.0L shares the same 3.622? (92mm) stroke with the 5.3L and 5.7L, but there are two or three different cranks.
*
All of the '99 - '00 cranks had the 12552215 casting with the wide flange. This is the only application for a crank that has a 92mm stroke and a wide flange.
*
All of the '01-'04 cranks used the 12552216 casting with the narrow flange, just like the 5.3L and 5.7L, but the 6.0L pistons weighed considerably more (470 grams) than the ones used in the 5.3L and 5.7L engines, so the bobweights had to be different. These may even be two different versions of this crank because the rods used in the LQ9 motors weighed 36 grams more than the ones in the LQ4 motors.
