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Modified Intake Dyno Charts
Can you use an extra 35 horsepower?
A stock cast iron intake is the most restrictive item on a small-block Chevy racing engine.
2 Barrel Intakes Comparison
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| TORQUE INFORMATION (ft.-lbs.) |
| RPM |
Stock
2 Barrel |
Acid
Intake |
Stage 1
2 Barrel |
Fully
Modified
2 Barrel |
| 4000 |
358 |
360 |
363 |
368 |
| 4500 |
326 |
339 |
347 |
354 |
| 5000 |
315 |
326 |
330 |
336 |
| 5500 |
299 |
310 |
313 |
322 |
| 6000 |
257 |
268 |
280 |
286 |
| 6500 |
220 |
230 |
240 |
247 |
| 7000 |
181 |
194 |
204 |
211 |
| Volumetric Efficiency |
| Fully Modified 2 Barrel |
88.7% |
| "Stage 1" 2 Barrel |
87.1% |
| Acid Intake Part #201XXXX |
86.1% |
| Stock 2 Barrel |
84.3% |
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TEST ENGINE: 355, Stock ’492 heads, flat top pistons, flat tappet cam, headers and stock 500 Holley 2 barrel carb. NOTE: The intake manifolds were the only components changed.
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Q-Jet 4 Barrel Intakes:
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| TORQUE INFORMATION (ft.-lbs.) |
| RPM |
Stock
Q-Jet |
Stage 1
Q-Jet |
Fully
Modified
Q-Jet |
| 4000 |
375 |
379 |
388 |
| 4500 |
356 |
367 |
385 |
| 5000 |
344 |
355 |
371 |
| 5500 |
323 |
339 |
357 |
| 6000 |
285 |
307 |
327 |
| 6500 |
251 |
266 |
289 |
| 7000 |
221 |
235 |
259 |
| Volumetric Efficiency |
| Fully Modified Q-Jet |
97.2% |
| "Stage 1" Q-Jet |
92.8% |
| Stock 4 Barrel |
90.7% |
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| TEST ENGINE: 355, Stock ’492 heads, flat top pistons, flat tappet cam, headers and 750 Holley 4 barrel carb. NOTE: The intake manifolds were the only components changed. |
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