Pushrods, how do I measure for...

.............I too fail to see y the op needs longer pushrods......He said its been together for a few years, I would suspect that there would of been a problem long b4 now if the push rods were in fact too short....I would check for wear in other places, as in cam, lifters ,rockers and valve tips or even the seats in the heads could be worn as well as the valve faces...kim........