Thanks for all the replies. After reading all the stuff from Blueskies and the trouble shooting of engine noises, I believe that my knock is main bearings. I have good oil presure at start up and start to lose it as the engine warms. When under real hard load, the knock is there but not real loud, however when you back off it comes back with a vegance -- no knock or engine noise at idle or not in gear. I did have some clutch chatter and found that the rear motor mounts needed to be tightned. Chatter is now gone, but engine knock is still there. I will drop the oil pan and check all the bolts on the flywheel and clutch and then all the bearings. I'll let you guys know what I find. It will be a few weeks before I get it done. Thanks again for your input, I'm sure I will have many more questions.