It may not be a precise measuring method but you should have some idea when
adjusting the valves, just by watching the springs compress when you rotate
the engine and cam. When my cam went it was pretty obvious because you
normally have one valve down, you adjust the opposing one that is up (using
the sum of 9). I kept waiting for a few valves to go down and they didn't.
At that point I knew I had a problem and sure enough, upon removing the
cam, I saw my Isky reground cam was literally lobeless on several once
lobed areas. So much for reground cams. Fortunately I had another spare
stock cam.
David Councill
67 BGT
71 BGT
At 09:40 AM 10/17/2000 -0400, Matthew Trebelhorn wrote:
>My '70 B roadster, daily driver, is in need of a valve job -- mostly worn
>guides, but I won't know what the seats look like until I get there.
>
>The thing that makes me worry about the cam is this: whenever I adjust
>the valves, they aren't tight (as would indicate wearing valve seats) but
>a few thou. loose. This makes me think of cam/tappet wear as the other
>major possibility...
>
>On the other hand, I may just be paranoid about cam wear because the
>previous cam (which may have been the original) wiped one lobe, resulting
> in one hot cylinder, blown head gasket, etc. etc.
>
>
>So, how do I check the cam for wear, preferably without (or, more to the
>point, before) tearing everything down?
>
>Thanks,
>Matt
>
>
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