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One lame idea.. but mostly a simpathy post

September 1 2012 at 11:36 AM
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Curt Boirum  (Login cboirum)
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Response to 390 valvetrain noise


I can't say this is very likely (especially since you said the heads are the only thing that's the same on the new engine), but I had what I thought was valvtrain noise on a rebuilt 390 with new rocker arm assemblies and it turned out to be a broken conterweight pin in my distributor. This caused the counterweight to bang around inside the dist. housing and affect power at highway speeds.

Your subject title just really caught my eye and I remember going through alot of the same frustration as you're describing. Hope you've figured it out and have that thing running smooth. That upper end rattling used to drive me crazy.

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