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If you look at the dyno test fast68plymouth did on his 383 the stock intake leaves about 40HP on the table vs. the RPM , no other changes .

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Anyone have a link to that study?

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It's in the tech archive ...

This is the best I could find , alot got lost on the cutting room floor . I remember 40-50 HP with the intake change but that may have also been with the carb change to the carter 750 because I would have run that exact combo on my motor most of the time ??? , but the chart here is showing almost 26 ??? I read thru this real quick and didn't see that actual test and what Dwayne had to say .



383 dyno results

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Hughes Engines does studies on the various Mopar
SB and BB intakes, usually to improve on the
flow characteristics. They seem to be on the right
track with the Eddy RPM for the 383.