Just for everyones' information; After pulling the radiator, oil pan, timing cover and verifying timiing was correct, after changing all valve springs, doing everything possible to find the rattle I replaced the F'N MUFFLER!!!!!!!!!!!!!! There was a loose baffle that under certain exaust conditions gave off a deep rattling noise; I thought it was engine related...... I spent almost a week on this...... guess I didn't know as much as I thought.
