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I think he is going to need some advance...fuel doesn't ignite/burn the instant it ignites. He is probably on the right path somewhere 6-10* before tdc...maybe more/less depending on what grade gasoline he is planning to run.
I have a feeling that you set your 5.7 back to "factory" specs (assuming computer controlled ignition since you are data-logging it)...and not actual tdc/0*.
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