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I actually did this on my 1989 Trans Am. I built up a 369" SBC motor and put it on an engine dyno and it made around 530hp. Installed the motor in the car and put it on a chasis dyno and it made 420rwhp. Now you have to keep in mind these are different dyno's and the calibration's are most likely not the same but in this instance it tends to support the around 20% loss. This was with a 4L60E transmission and a Yank SS3600 converter.
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