Posted 2019-08-30 11:55 AM (#586785 - in reply to #586696) Subject: Re: 61 Newport coupe. canada
Retarding the cam is not required but if you look closely at the cam specs. the factory apparently did. It helps by moving the peak power to a higher RPM. I don't believe this was done on the later Chrysler letter cars with the "short" long ram because they had a more aggressive solid lifter cam. I didn't do this on my 383 when I installed the ram manifold but was not aware of it at the time.