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.