Small Block Chevy Cast Iron Intake Manifold Dyno Charts

Can You Use Some Extra Horsepower?

A stock cast iron intake is the most restrictive item on a small-block Chevy racing engine. Let's face facts: Stock cast iron intake manifolds were designed for passenger cars where the engine never sees 3,500 rpm. In a race application, the engine is never under 3,500 rpm. We have seen lap times reduced a couple tenths of a second with a Brzezinski Racing Products Modified Cast Iron Intake Manifold.

Horsepower Comparison 2 barrel Cast Iron Intakes

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2 Barrel Intake Manifold Compairson
TORQUE INFORMATION (ft.-lbs.)
RPM Stock
 
Acid
Intake
 Stage  1 
 Fully
Modified  
4000 358 360 363 368
5000 315 326 330 336
6000 257 268 280 286
7000 181 194 204 211

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.


"If you are running Hobby Stock, Limited Late Model, or Sportsman, you couldn't miss hearing about Brzezinski because he is the prime exponent of having the stock cast iron intakes and heads pull more air than ever before.  He has learned all the good part numbers and the ways to make them respond."

-- Alex Walordy, "Cast-Iron Creativity" - Circle Track Magazine. 

 

Horsepower Comparison 4 barrel Q-Jet Cast Iron Intakes

Q-Jet Modified Intake Dyno

 Q-Jet 4 Barrel Intake Manifold Compairson
TORQUE INFORMATION (ft.-lbs.)
RPM Stock
Q-Jet
Stage 1
Q-Jet
Fully
Modified
Q-Jet
4000 375 379 388
5000 344 355 371
6000 285 307 327
7000 221 235 259

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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