GOFASTMG@aol.com wrote:
>
> Jeremy,
> The height of the cam lobes is really in-material!.
> What matters is the difference between the height of the cam lobe at the
> apex of the lobe and the height of the "heel" of the cam( that portion of
> the cam lobe directly opposite of the apex of the lobe. This difference is
> known technically as lift.
> In the case of reground perfromance cams, more material is taken off the
> heel of the lobe than the apex, thus generating more lift. For "stock " cams,
> equal amounts are removed in the grinding process for approx. "stock" lift.
> Measuring the height of the lobes from the surface of the shaft would be of
> use only if you have the measurments of THAT cam when it was new, so as to
> check for wear. But it would take a dial indicator to really be accurate.
> I hope you are now as confused as I am
>
> Rick Morrison
I've been following this a bit, and thought I'd toss in my two cents
worth - I just bought a 'performance' cam from Northwest Import Parts,
and the weay he did it is just the way it is described here - material
is ground from the heel to make the effective lift greater. With
mechanical lifters, the difference in height can be adjusted out. That's
the way hotrodders in my distant mis-spent youth did it, too (the '50s
and '60s).
Sam Staton
'73 B Rdtsr 'Maggie'
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