I have ford 302 heads with crane double springs and ford racing roller rockers...1.6...but i do not know what my pushrod length is.. can anyone help me? it is for a ford 308.
You need to get an adjustable pushrod length checker, and you need to use it to get proper valvetrain geometry. Once you are sure you have proper valve train geometry, measure you adjustable measuring pushrod with something like a digital caliper and call Crane or Comp or some other cam maker and they can send you custom length pushrods no problem, or you can order a matching part # from their existing catalog.
If you do not have a pushrod length checker -- you can go ahead and remove one pushrod and bring it to any local machine shop. Or even a competent autoparts store.
They can check the length for you; granted they must be competent -- going to an autozone that is chock full of ricers will most likely net you headaches and no real answers.