408 ignition curver advice

mbaird said

True for many aspects of tuning but wouldn’t wide open throttle at max rpms under load be similar in both cases ? In the car engine bay heat would become a factor but that would call for less timing I would think .

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There are more aspects to a power curve than wide open. I can certainly see the added timing not making a difference in peak numbers. What about in the car and under the true load of the car at lower RPMS? It's entirely possible it could pick up elsewhere. Do you happen to know the cranking PSI, Michael?