Re: not enough backpressure?
Backpressure is needed on engines that have "tuned" exhaust systems. Often times with high performance motors the exhaust system is a significant part of getting the high performance from the motor, but, lets not regard the Model A standard motor as a "high performance" racing engine.....
Also, with the tuned motor the performance is limited to specific RPM values.
Smokey Y. wrote a great book in the past about the methods used to tune the motor, I really do not think that this is relevant for the Model A !
Marc
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