Sori DBL post Ignore

Ok guys just installing Shaft Rockers and the Crower rev kit with new Manton 3/8 pushrods .......wow pushrods are sure close to head when valves are closed, prelim engine rotation shows it gets a little better when valves open ......... how little clearance can I get away with , pls tell me a "C" hair is enough

Is it normal that a change from Stud Rockers to Shaft Rockers would move pushrods in more ?? New PR are .150 - .200 shorter

Bill