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Stock heads/cam LT1 cars run more than 21 degrees peak, but also it varies by RPM. On E you can get up to 28 degrees peak, again variable with RPM and cam position. But the only reason to command 28 on E is so that the ECU will pull down from 28 when intake temps, coolant temps or oil temps get hot. So you really end up running about 27 peak.
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GM Gen V Calibrator
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