I am goings to get Crower 62403s cam shafts and Crower Staff said that you don't need valve springs and retainer, if you keep your stock redline. Well I was wandering do you think its worth it to purchase the valve springs. I am planning to do the cams swap at home I have a torque wrench and i know whats the specify lbs of torque for each bolt. But my question is if i get valve springs and retainer...........and install them at home do I have to do a valve adjustment. This must be done professionally correct. Or can I just slap them in without worries. Is there anyone out there redline higher than stock redline point on a stock LS block. I know sooner or later your R/S will damage the pistons and rod. But how long will it last. Not taking it to pass 7k on a daily bases. Planning to redline at 7500 on stock block. If I do blow the block......what conponents are damage?