Here is a magazine test of intake manifolds

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Short Manifolds (Less Than 5.00 Inch Carb Pad Height)

Manifold PN Price                           Peak TQ Peak HP Avg. TQ Carb Ht. TQ at 3,000
Edelbrock EPS 2701 $139.95            506 461 466.2 4.80 476
Edelbrock Air Gap 2601 $225.95      504 458 464.7 4.92 478
Chevrolet ZZ4 10185063 $239.95    500 471 464.5 4.95 467
Weiand  Warrior 8125 $151.95        501 463 463.5 3.65 470
Weiand  Warrior 8120 $134.95        502 459 462.8 4.62 471
Summit  226012 $131.95                  498 459 461.0 4.65 468
Edel Performer 2101 $157.95          494 456 459.1 4.60 470
P. P.Cyclone 52001 $143.95              487 436 449.3 4.72 471

Medium Manifolds (5.00 to 5.30 Inches Carb Pad Height)

AFR Titon 4804 $579.00                     510 484 473.6 5.29 467
Edelbrock Air Gap 7501 $234.95      508 474 471.2 5.26 473
Edelbrock RPM 7101 $174.95           504 470 468.3 5.25 474
Weiand Warrior 8501 $217.95          504 466 466.3 5.24 471
Summit Stage 3 226010 $182.95      503 464 465.6 5.25 471
Edel RPM Q-Jet 7104 $199.95            501 465 465.3 5.25 471
Summit S 2 226014 $132.95              502 469 464.9 5.18 466
Weiand Speed War 8150 $145.95     502 467 464.9 5.18 467
Jegs 513000 $ 99.99                            500 471 464.5 5.29 462
P P Crosswind 52026 $199.95           496 457 459.5 5.24 469

Tall Manifolds (5.30 Inches and Taller)


P P Typhoon 52021 $162.95              499 469 465.3 5.33 471
TFS  30400222 $224.95                       501 465 465.2 5.39 473
Dart SHP 42811000 $231.70              501 464 463.7 5.52 470
P P Cyclone-Plus 52013 $177.95       497 458 461.0 5.37 471
Chevy Iron 14096011 $261.06          494 457 459.0 5.45 468