Have a Briggs 24hp intek twin that bends exhaust valve pushrods. I can put a pushrod in it, leave rocker arm loose, roll over by hand and it will bend pushrod. Valve spring is compressing same as intake valve spring. I can push valve spring by hand, pushrod is seated in socket in rocker arm socket, other end seats in socket also. Verified nothing in either socket, leave rocker arm loose, roll over motor, and bends pushrod. It's almost like pushrod is too long, but it is exact same as intake pushrod. I noticed that while rolling motor, intake pushrod spins, exhaust does not. Any quick response?