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Old 05-16-2010, 06:25 AM
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406 Starting and High RPM Issues

From the help everyone has provided in my previous thread: 406 sbc, build questions
I have a great running engine with some very impressive power (at least for my application) However, I do have a couple issues that I don't seem to be able to tackle.
1) It is a bear to start! I have a high torque starter that spins the engine easily until it starts to fire... and then it struggles until it fires
2) At higher RPM's and under load, the engine sounds like my valves are loose (or as I've heard others say, it "Diesels")

I'm leaning towards ignition issues but I'm not 100% sure... I have a pretty much stock HEI system except for a recurve kit in the distributor. Any thoughts?

(I've started collecting parts: MSD Billet Distributor, Blaster 2 coil, Mallory Wires... and looking for a MSD 6AL box)

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Old 05-16-2010, 07:42 AM
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406 Starting and High RPM Issues

My first thought would be to check the timing. It sounds like you may be running too much advance.
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Old 05-16-2010, 10:58 AM
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Sounds like you are to far advanced. This is not a good situation. If you dont get it under control you can cause severe engine damage.
What is your base timing and total timing without vacuum advance connected
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