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Supercharged 350ci Chevy - Big Power From A Little Blower -

Isn't supposed to happen, but 512 lb-ft of torque and 504 hp from a stock 350 short-block and stock Vortec heads is awesome!

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When you consider that the addition of a very compact supercharger on a very mild engine with stock iron heads made an additional 140 hp at the peak of its power curve representing a 38 percent power increase over normally aspirated-that's plenty impressive. The beauty of this combination is that you can drive it anywhere, and there's always power on demand. You never have to open a valve, refill a bottle, or spend additional money to go fast. Even the initial investment is reasonable at just under $2,500. In addition to the Vortec-head manifold, Magnuson offers this same blower in the more traditional 12-bolt intake-manifold configuration.

Of course, this stimulates conjecture on how this engine would respond with a better set of cylinder heads. Imagine bolting on a set of AFR 195, TFS 195, or Dart Pro 1 200cc heads and a slightly more aggressive camshaft with more lift. While that gets into more coin, the power would be ultra-impressive.

CAM SPECS
Description Duration (Adv.)
(degrees)
Duration (0.050)
(degrees)
Lift
(inches)
Lobe Separation
(degrees)
Crane Hyd., Int. 288 226 0.488* 114
PowerMax, Exh. 296 234 0.504*  
*Stock lift at 1.5:1 rocker ratio is 0.458/0.473. The above lift figures are calculated using a 1.6:1 Crane Gold Race rocker.

Power Numbers
The following chart and graph illustrate the big difference delivered by the Magnuson supercharger.

Test 1 is the normally aspirated 350ci Chevy with stock Vortec heads, Holley 750 carburetor, 151/48-inch headers, and Flowmaster 211/42-inch mufflers.

Test 2 is the same exact engine except with the addition of the Magna Charger 122ci supercharger.

  TEST 1 TEST 2   DIFFERENCE PCT. GAIN
RPM TQ HP TQ HP Boost
(psi)
TQ
(psig)
HP HP
1,800 - - 412 162 4.9 - - -
2,000 333 127 412 162 4.9 79 35 24%
2,200 323 135 426 178 5.3 103 43 32%
2,400 335 153 449 205 5.7 114 52 34%
2,600 352 174 462 229 5.9 110 55 31%
2,800 366 195 476 254 6.1 110 59 30%
3,000 377 215 470 268 6.2 93 53 25%
3,200 385 235 480 292 6.3 95 57 24%
3,400 393 254 495 320 6.5 102 66 26%
3,600 400 275 500 343 6.5 100 68 25%
3,800 406 294 511 370 6.4 105 86 26%
4,000 410 312 512* 390 6.3 102 78 25%
4,200 411* 328 512 410 6.2 101 82 24%
4,400 407 341 510 427 6.2 103 86 25%
4,600 400 350 509 445 6.1 109 95 27%
4,800 390 357 500 457 6.1 110 100 28%
5,000 380 362 499 475 6.1 119 113 31%
5,200 370 366 490 485 6.2 120 119 32%
5,400 359 368* 472 485 6.4 113 117 31%
5,600 345 368 461 491 6.6 116 123 33%
5,800 330 365 449 496 6.8 119 131 36%
6,000 318 364 441 504* 7.1 123 140 38%
6,200 - - 420 496 7.4* - -
Avg. 380 257 473 367 6.2
Peak 411 368 512 504 7.4
Power/ci 1.17 1.05 1.46 1.44
SOURCES
Crane Cams
530 Fentress Blvd.
Daytona Beach
FL  32114
3-86/-252-1151
N/A
www.cranecams.com
Pioneer Inc.
GM Performance Parts
www.gmperformanceparts.com
Powerbuilt Tools/Alltrade
Long Beach
CA
alltradetools.com
Holley Performance Products
1801 Russellville Rd.
Bowling Green, KY 42101
KY  42101
270-782-2900
www.holley.com
Racing Systems Analysis
Phoenix
AZ  85022-5736
Magnuson Products Scoggin-Dickey Parts Center
Lubbock
TX
N/A
www.sdparts.com
Performance Distributors
Memphis
TN
9-01/-396-5783
performancedistributors.com
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