Title says it. I have an oil pump marked with part number #12556436

I've searched around and found some posts that suggested this is a 2001+ lsx oil pump (supposedly they are all the same). I've also found posts that suggested the 2001+ oil pump had a different part number, #12586665. So which is it?

 

Did you try calling a dealer to explain this? they appear to be gm part numbers

 

12556436 doesn't appear to be the right number (edit: see what Paul Bell says below).

but 12556434 was superceded by 12586665.

 

Listed as a LS6 pump. It's in the last line here: https://ls1tech.com/forums/3064659-post19.html

 

i think that # belongs to early ls1 oil pumps. i had one that had a date of 97 on it.

 

This was pulled out of a 5.3 engine. I recently found out that all the post 2001 pumps were the same so that would explain why it had the same part number as the ls6. Thanks for the input everyone.

 

I just pulled 1 out of an 2011 6.0L L96 with the same part numbers you have listed

 

Hey roadracer, normally I'd give you a big LS1tech welcome but you've been with us since '09 and your first post was today?

Very well, keep 'em coming!