I remember my LT1-powered Impala SS making a ticking noise similar to what you describe when the EGR valve died. It could be just the solenoid, or maybe the gasket, or the EGR itself. It's bolted to the backside of the intake manifold - probably a royal PITA to reach under the windshield cowl, but it was an easy job on my Impala.
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Seeya,
Steve R. in North Jersey
'16 Go-Mango Dodge Charger R/T. It's so good to be back in a V8-powered, RWD car!
Former Toy - '88 Monte SS - had lots of mods...
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