It's worthwhile to get the vernier adjustment sprocket from Cambridge
motorsports. It's also worthwhile to get an accurate profile of your cam
so you have a point of departure for fiddling with the timing. You may
find some substantial inaccuracies that either have to be compensated
for (by splitting differences) or that make replacing your cam
worthwhile.
I used the book "Hot rodding small block chevys" as a procedure guide.
> -----Original Message-----
> From: Richard Taylor [SMTP:n196x@mindspring.com]
> Sent: Wednesday, April 22, 1998 5:57 AM
> To: fot@autox.team.net
> Subject: Re: Cam Timing III
>
>
> Amici again,
>
> I apologize for being so slow witted about all this but as I see it
> the cam
> sprocket is through-bolted to the cam shaft. And there are only two
> pair of
> bolt holes offering only two chances, each a half a tooth apart, to
> get it
> right. By reversing the sprocket there are two more shots at it, each
> a
> quarter tooth apart from the reverse side. This means that there is no
> opportunity for any more accurate adjustment than finding the right
> bolt
> holes. Hence the closest adjustment one can have is 1/4 of a tooth on
> the
> cam sprocket.
>
> What I have described here is a synthesized collection of gossip,
> rumor,
> old manuals and my own low-grade experience. If it is correct (and I
> have
> no great confidence that it is), I would appreciate any confirmation I
> can
> get. Besides then I don't have to buy a dial indicator.
>
> Thanks again.
> Richard Taylor
> Atlanta
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