Going from 1.5 to 1.7 won't change duration #s if lash is set accordingly , ie: .020" lash clearance when running 1.5 RR would require a .023" clearance when swapping out to 1.7RR.......if lash clearance is'nt 'corrected' duration @ seat will increase.


Last edited by 602heavy; 01/03/11 08:59 AM.