It's called duration and lift. Both are affected by valve clearances. You
can change the duration and lift a little by varying the settings but I
would be careful on the exhaust valves as the "seat time" with the head is
what keeps them cool.
Mike
----- Original Message -----
From: <JOHNSOF@aol.com>
To: <dscrib2@hotmail.com>; <datsun-roadsters@autox.team.net>
Sent: Sunday, June 16, 2002 10:21 AM
Subject: Re: 2 cam questions
> Dana; the "B" cam has a small B stamped in the very back of the cam, back
> behind where it's held by the rearmost cam tower. In the car, you'd have
to
> look with a small mirror (with the valve cover removed, of course).
>
> My understanding is that it's the mostly the degree or length of lift
that's
> different between the "A" and "B" cams, although the "Solex" cam has a bit
> higher lobe (the valve opens a skootch farther). In other words, the B
cam
> opens sooner and stays open longer. The valve lash setting you'd make is
> unaffected by anything on the lobes, as you make this adjsustment when the
> lobe isn't contacting the rocker arm. Depending on what you've got, the
> ignition timing settings might be a little different.
>
> Fred J.
> with an engine (with a "B" cam) sitting on a stand a couple of feet away
from
> me!
> '69 SRL
> WI
>
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