Didn't you just swap the oil pan and pickup to the LS4 pan?
Originally Posted by Google
Hey I just wanted to pass this on to you guys. 90% of oil pressure issues Ive found on these 6.0 engines is the O-ring between the oil pump & pickup tube..They deteriorate or sometimes are partially torn from factory ..This causes low oil pressure due to air getting pulled in with the oil..
and the same talk on pirate http://www.pirate4x4.com/forum/chevy...-start-up.html