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383 Intake Manifold Comparison
#2205968 ..... {1963 thru 1967 Casting} .................... 14.17 ..... 98.04
#2951666-1 .. {late-1970 and 1971 Casting} .............. 14.06 ..... 99.43
#2806301 .... {1968 and 1969 Casting} ...................... 14.04 ..... 99.11
Edelbrock Performer {#2186} .................................... 14.01 ..... 99.58
Mopar M1 Dual-Plane {#4529117} ............................. 13.99 ..... 100.02
Weiand Action Plus {#8008} ...................................... 13.97 ..... 99.78
Edelbrock {DP-4B} ................................................... 13.93 ..... 100.12
Why no Performer RPM?
Here is what this data suggests to me. The first small 4 bbl intake may have down 5 to 10hp over the others. All the rest are the same. The slight differences are mostly weather conditions, and maybe driver consistency and tune. For what it is, it is making nice power and is a well balanced package IMO.
Its a 280 to 300 hp deal and the cam and/or carb are the power limiting factors, not the intake. Same testing on a 350 or 375 hp deal and you'll see some performance separation between manifolds.
