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Pete · 07-30-2021, 04:07 PM

This can become a whole new subject of discussion, albeit a dull one.
I have several original Isky spec sheets, advertisements and original cam tags for the 77B.
Some date back a LONG time.
The oldest shows, in. .011 and ex. .013.
Another shows, .012 and .014.
Another shows, .014 and .014.
And now I hear .008 and .014 is the rage.

All the same cam grind??? Who knows? Did they change the masters or the literature for some reason?

More than likely, some of the spec sheets were put out by companies that were in the cam grinding business and were bootlegging Isky grinds with a similar one that had slightly different clearances. This was and is a common practice. The extent some people will go to for deception is interesting sometimes. Back around the 60's or so, Isky started putting box car one time seals around his cams to show it was an original. This worked fairly well till one guy figured out how to duplicate the seals so that idea went down the drain.

One thing for sure, if in doubt, run the cam in question through a Cam Doctor or degree it in the engine you intend to run it in.

07-30-2021, 04:07 PM	#7
Pete Senior Member Join Date: May 2010 Location: Wa. Posts: 5,408	Re: Valve Lash Esky. Cam This can become a whole new subject of discussion, albeit a dull one. I have several original Isky spec sheets, advertisements and original cam tags for the 77B. Some date back a LONG time. The oldest shows, in. .011 and ex. .013. Another shows, .012 and .014. Another shows, .014 and .014. And now I hear .008 and .014 is the rage. All the same cam grind??? Who knows? Did they change the masters or the literature for some reason? More than likely, some of the spec sheets were put out by companies that were in the cam grinding business and were bootlegging Isky grinds with a similar one that had slightly different clearances. This was and is a common practice. The extent some people will go to for deception is interesting sometimes. Back around the 60's or so, Isky started putting box car one time seals around his cams to show it was an original. This worked fairly well till one guy figured out how to duplicate the seals so that idea went down the drain. One thing for sure, if in doubt, run the cam in question through a Cam Doctor or degree it in the engine you intend to run it in.