I just had my car in the shop getting its chain, tensioner, guides etc changed to hopefully prolong my engine + get rid of that rattle. However, the rattle is not as loud but still there. I'm thinking its my lifters but as i was reading the forum, it sounded more like the main bearing. I really have no idea what this is or how it effects knocking. The set seems cheap enough but how much work goes into changing this? Where would i go to check my oil PSI or can i do it myself? WHat is all involved in taking off the head to check springs,( i read a thread on here that by pressing on the springs and depressing them, they need to be replaced i believe?!) Also, maybe its just me but whenever i'm shifting, as i'm taking out the clutch and puttin the gas back in, it feels like i'm hitting a wall and its making big bam type noise. Am i shifting at too low of RPM? WHen i've check it seems more like 3000 -3500. I had my clutch replaced about 9 months ago.