| [GMCnet] Re: Cam sprocket - plastic or not? [message #365479 is a reply to message #365478] |
Fri, 16 July 2021 19:09  |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Stock or plastic makes no difference. It's the combination of wear between
gears, sprockets, and chains that gives you the slack that RETARDS CAM
TIMING, the effect is that the torque curve is moved upwards in RPM'S.
If your 403 won't pull the hat off your head at 2200 rpm, but runs
like a scalded dog at 3600+ RPM'S, you probably have a stretched timing
chain. New double roller chain and sprockets, advanced 4° or so will wake
the lower rpm range up.
Jim Hupy
Salem, Oregon
On Fri, Jul 16, 2021, 3:58 PM Greg Crawford
wrote:
> At 67,000 miles, my gear looked good but the chain had stretched to the
> point that half of the crank gear teeth on the bottom were visible above the
> chain.
> --
> Greg Crawford
> KM4ZCR
> Knoxville, TN
>
> "Ruby Sue"
> 1977 Royale
> Rear Bath
> 403 Engine
> American Eagle Wheels
> Early Version Alex Sirum Quad bags
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> GMCnet mailing list
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