Originally Posted by
sanderson231
You don't want to go anywhere close to 14.7:1. If you did run there at WOT there will probably be knock and the best case scenario is that the knock sensor would detects it and the PCM would pulls timing. The worst case scenario is engine damage.
During PE you need excess fuel to ensure that all the oxygen in the mixture is consumed. Otherwise you leave power on the table. Excess fuel also protects the engine. Your new engine is not a big step-out from the 350 that is in the car. GM spent countless hours on the dyno developing the power enrichment and spark timing value that are in the calibration. There is little reason for change. Keep it simple. Change the displacement per cylinder from 711 to 784. Change the fuel injector flow rate to match what ever fuel injector are installed.
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