If anybody can help me with this I would greatlty appreciate it. I was building up the my 5.0 in my 95 ford mustang. I put a B303 cam, gt40 intake, full length headers, and I had some work done on my cylinder heads. They milled .003 off my heads and put bigger intake/exhaust valves, and port/polished them. After I put everything together I started the motor and the lifters/pushrods were making a very loud noise. I took the valve covers back off and noticed the pushrods on all the exhaust valves were bent. I called the guy that did the work on the heads and he said the valve springs were only made to handle .460 lift and the cam lift is .480. Obviously, I have a problem here - but my question is why did it not bend the pushrods for any of the intake valves? The cam is balanced .480/.480 intake/exhaust. It appears the intake/exhaust springs are the same. Any help would be greatly appreciated. (the guys suggested buying springs that would handle upto .500 valve lift) Would that really solve my problem or does another one exist.