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Old 01-06-2013, 04:12 PM
71fj40guy 71fj40guy is offline
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Stock SBC 350 Crate Motor valve chatter under load

I'm getting valve chatter under load on my stock 290 hp GM Perfomance 350 crate motor.

I have replaced the plugs, plug wires, distributor, and did a full valvetrain check and valve adjustment just in case.

Its running a late model Rochestor Quadrajet carb with electric choke. The only aftermarket parts are a set of aluminium valve covers, MSD E-Curve distributor, Blaster coil, 8mm Autozone plug wires, Champion platinum plugs, Sanderson QP1000 headers, and an Edelbrock air cleaner.

Right now I have the total timing set at 32 degrees and 12 degrees at idle. I have also tried 34 total and 14 idle too and it still chatters.
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