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Pete · 07-31-2021, 02:31 PM

The base circle is not dependent on the clearance ramp or vice versa. The design of the cam determines each. One important parameter of the design is that it must fit the diameter of the lifter.
The base circle diameter of the early 77B is .950.
You can not determine the running clearance by the base circle diameter.

07-31-2021, 02:31 PM	#11
Pete Senior Member Join Date: May 2010 Location: Wa. Posts: 5,408	Re: Valve Lash Esky. Cam The base circle is not dependent on the clearance ramp or vice versa. The design of the cam determines each. One important parameter of the design is that it must fit the diameter of the lifter. The base circle diameter of the early 77B is .950. You can not determine the running clearance by the base circle diameter.