I have heard that there as been like 3 diffrent versions of LS1 engine and I decided to dig up some info on my 99 LS1 I got the following info _|_2560688 that was on my intake manifold, and the following on my heads 9817522274739855 accompanied by three little numbers on top of the series of numbers that read 853, any info would be GREATLY appreciated!!!!

 

can anyone help?

 

there are very minor differences in the LS1 engines from 97-2000, in 2001 GM used the LS6 intake and a different cam
lots of information here
http://www.automotiverebuilder.com/ar/eb040538.htm

 

great info dude! thanks alot!