Could be time to replace the damper. If the rubber is shot the pulley (with
the timing mark) can rotate with respect to the crank causing timing to
shift.... Isn't that so, Glen?
Or, perhaps it could visit the damper doctor (damperdoctor.com) for a
rebuild.
Hal
On Thu, Jun 25, 2009 at 11:42 AM, Dave G. <kk7ss@verizon.net> wrote:
> Bear in mind that the DPO's of The Beast used bits from a number of
> different years to put it together...
>
> Recap... Timing set, valve lash set, carburretion set, idle great but
> running cool and spitting back at steady rpm's above ~2300...
>
> Thanks to Bill M, who generously gave me a manifold vacuum take-off
> nut, I hooked up my vacuum guage.
> First thing indicated was low vacuum at idle ~14", a possible
> indication of bad timing.
> I moved the distributor until vacuum was at 20" and, presto, no more
> spitting back at 2500rpm (haven't taken it higher yet!)
> Checking the timing mark (a groove across the outside *not* a dimple)
> on the crankshaft pulley with the indicator on the timing chest cover
> showed that the mark was now off by ~9 degree's!!
>
> Either this was not the original pulley or something else is wrong!!
>
> --
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