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The Hot Rod Test of the 383 Intakes - The DP4 versus the Performer (Stock Factory Intake Was Not In That Test)

From what I remember there was like 1 ft lb difference between the two and something like 4-5 hp WOW !!!

And personally I have seen dyno numbers on both intakes and they where within a few hp either way on a mildly built 383 - Apples to Apples

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"mildly built 383" being the key element here. Now add a lot more cam compression, carb, better exhaust and see which prevails.

I have a SB Perf. and an old LD4B, flip them over and look at the cast runners and huge difference. The Perf. looks like it would be lucky to hit 5k rpm. Which was OK back in the day when it was designed for its intended market.