[Fot] TR6 camshaft "CB"

[Chip Collingwood]

Not certain about the cam "CB" designation. And the distributor drive being
off a tooth has nothing to do with cam timing. That is a relationship
between the cam and the crank set by how you install the cam sprocket. The
distributor drive only orients the proper position of the distributor so
that its body doesnt contact the block and prevent the "ignition timing"
from being set properly.
I believe there are 2 big issues with the cams/blanks. Most important is
always installing cam bearings as it will prevent any oil pressure loss due
to poor tolerance of original castings. And second is the oil pump for the
valve train is affected by rear cam bearing surface/cut. Evidently some
blanks are inadequate in comparison to the originals. I would source a good
original blank and have it cut to your specs.


On Mon, May 8, 2023, 1:50 AM Bob Kramer via Fot <fot at autox.team.net> wrote:

> I am rebuilding an engine for a local club member and I just tore down the
> engine. It looks like someone rebuilt it but it did not run very long until
> it coked up the new pistons and valves. The camshaft installed looks to be
> from an unmarked new core and the only stamping on it is a capital CB on
> the back boss.  Has anyone seen this camshaft designation before? It was
> not timed correctly and the distributor drive was off by a tooth so I want
> to make sure I set him up with a car that will run correctly this time.
> I've heard that some of the blanks were not of a good quality so this is
> another worry.
>
> Bob Kramer
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