Hi again, I'm here to post about a problem I've been having for a while now and to find any solutions to this issue. For the past 2 months, I've been trying to find the exact place of origin to this problem, and with the help of another use, ole4 (pretty sure that's his name), I've scoped it down to my cam. The problem is, is that when I'm pulling my engine over I hear this almost clunking/ticking noise. It's very consistent when it happens and only does it when the intake spring is compressed, exhaust spring is compressed, and when both are returning to their non-compressed states. I've looked all around the internet to see if anyone else had the same issue and I did find someone that did. But, the forum had no permeant solution to this issue, and only temporarily stopped it by using a washer as a spacer. To add onto the problem I am having, I am 99% sure it's my cam thrust play (pretty sure that's what it's called). At least that's what the forum was talking about. To answer a question that you may be have, no it's not my valves, I've checked twice and both clearances have came out to well over 0.125, so clearance is not an issue. It only started to make this sound when I installed 1. 45lbs dual valve springs, 2. Resize the valves to 28.5mm and 25mm, and 3. Install 1.3 black venom rockers. I have a billet flywheel and rod, hot-265 cam, and a pwk 26mm carb. I plan to add a flattop piston when I get this problem solved. Some ideas I've had were to use a billet side cover because it comes with shims and that might help. Another idea was to but cam shims, but I don't understand why because I've never had this problem up until now, could push rod length be an issue? I'm using 5.200 length (stock for 212) but I tried using 5.100 but they seem to be too small. Any help would be much appreciated, I really just want to get this thing done and out of my hair. Again sorry for posting some much about help, I hate it just as much as the next person. If there any questions you have, feel free to ask, I'll give any info if necessary.