As most of you are aware I have been having valvetrain noise ever since I put my motor back together 4 weeks ago. So with no results after replacing lifters and pushrods and rockers I am going to spend more money and replace the valve guides. I ask myself why and I answer because I dont know what else could be causing this noise. I had new seals put in and a 3 angle valve job done along with .007 taken off the heads. I have tried shorter and longer push rods and shims also and I still have noise. Can I replace the valve guides myself or do I need to take it back to the machine shop? These are factory heads on 302.