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Aftermarket Parts - Are Premium Parts Worth The Price?

TEST 1 TEST 2 TEST 3   DIFFERENCE
  Weiand   Holley-Dorton        
  Air Strike 1x4   Holley 1x4   Weiand 2x4      
RPM TQ HP Fuel TQ HP Fuel TQ HP Fuel TQ HP
2,500 403 192 101 395 188 80 -- -- -- -- --  
2,700 386 198 108 384 197 85 -- -- -- -- --
2,900 375 207 107 384 212 97 -- -- -- -- --
3,100 400 236 110 400 236 98 -- -- -- -- --
3,300 441 277 122 419 263 96 -- -- -- -- --
3,500 459 306 134 428 285 104 -- -- -- -- --
3,700 471 332 146 435 307 118 397 279 155 -74 -53
3,900 481 357 154 439 326 126 404 300 148 -77 -57
4,100 483 377 164 448 350 133 420 328 151 -63 -49
4,300 480 393 174 456 373 144 441 361 155 -39 -32
4,500 478 409 182 456 391 155 450 386 161 28 -23
4,700 473 423 188 456 408 164 456 408 164 17 -15
4,900 467 436 194 457 426 172 462 431 169 -5 -5
5,100 459 446 199 460 447 180 462 449 179 +3 +3
5,300 456 460 206 456 460 184 456 460 194 0 0
5,500 448 469 215 448 470 189 449 470 206 +1 +1
5,700 437 474 222 438 476 196 440 477 217 +3 +3
5,900 425 477 226 427 479 201 427 480 225 +2 +3
6,100 412 479 228 416 483 205 411 477 228 -1 -2
6,300 400 480 238 404 485 210 394 473 238 -6 -3
6,500 387 478 250 387 479 222 378 468 251 -9 -10
Peak 483 480 250 460 485 222 462 480 251
Avg. 440.4 377.8 174.7 429.4 369.7 150.4 --- --- ---    

Aftermarket Parts Weiand Stealth Air Strike Dual Plane
Even with a strong roller... 
   
  read full caption
Aftermarket Parts Weiand Stealth Air Strike Dual Plane
Even with a strong roller cam, Dart 215 aluminum heads, and making 480 hp, the Weiand Stealth Air Strike dual-plane made the best overall power of the three intakes we tested. And it was only down 5 hp at the peak against a very good single four-barrel Holley Keith Dorton manifold.
Aftermarket Parts Holley 0 1850S
We chose the twin 600-cfm... 
   
  read full caption
Aftermarket Parts Holley 0 1850S
We chose the twin 600-cfm carburetor package for this test, but even for a strong 383 it appears that the smaller 450-cfm Holley carbs would have been a better choice. Unless your engine is making over 550 hp, we'd go with the 450 cfm carbs.
Aftermarket Parts 600 Cmf Carburetor Package
The latest (-9) version of... 
   
  read full caption
Aftermarket Parts 600 Cmf Carburetor Package
The latest (-9) version of the 0-1850S now comes with no external float adjustment and no sight plug screw to externally check the float level. Holley did this to reduce the number of returns on its carburetors from under- educated carb tuners.
Aftermarket Parts Holley Manifold Dyno
Holley Manifold Test

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