RPM fluctuating between 4800-5000

[Anonymous]

I was wondering if this is a Tach problem or is the stock HEI giving out above 4800? It fluctuates crazy back and forth whenever it goes beyond 4800...

Chevytown

 

[MustangSix]

Is the engine fluctuating or just the tach? If the engine is bouncing between 4800-5000 you may have a case of dead valve springs causing float.

 

[Anonymous]

It's only the tach. The engine still sounds like it's climbing the RPM's and very strong. There is absolutley no skip/stutter in the engine at that range, only the tach. If it was the HEI giving out, (needing a hotter/multispark unit) will the engine show any signs?