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Mazda B-Series Stock Hood Body Drop - Body-Drop Remedies

Keep Your Stock Hood
By Mike Alexander
Photography by 519 Kustomz
Mazda Bseries Custom Front End
Mazda Bseries Stock Motor
1. Here's a look at what you... 
   
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Mazda Bseries Stock Motor
1. Here's a look at what you might be stuck with after body-droppping a Mazda with a stock motor. This will be cured by building a new intake plenum.
Mazda Bseries Engine
2. Everything that was protruding... 
   
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Mazda Bseries Engine
2. Everything that was protruding was removed to make room for the new intake that will be built.
Mazda Bseries Template
3. With the old intake in... 
   
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Mazda Bseries Template
3. With the old intake in hand, a template was made for the intake-mounting flange. It was traced from the original intake plenum. The new one was built from 3/8-inch thick plate 6061 T6 aluminum.
Mazda Bseries Tubing
4. Next, a length of 4x.125-inch... 
   
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Mazda Bseries Tubing
4. Next, a length of 4x.125-inch alum-inum tubing was cut and capped with a piece of .25-inch aluminum plate.
Mazda Bseries Intake
5. Four lengths of 1.75x.125-inch... 
   
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Mazda Bseries Intake
5. Four lengths of 1.75x.125-inch alum-inum tubing were fish-mouthed on one end, then welded between the flange and body of the intake plenum.
Mazda Bseries Runner Holes
6a. Intake runner holes were... 
   
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Mazda Bseries Runner Holes
6a. Intake runner holes were drilled with a 1.5-inch hole saw, after the two halves were welded together. We used the tubes as a guide so that the holes would be on center and leakproof.
Mazda Bseries Tube
6b.
Mazda Bseries Plenum
7. The plenum was then test-fitted... 
   
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Mazda Bseries Plenum
7. The plenum was then test-fitted onto the engine to determine the position the throttle-body flange would be placed.
Mazda Bseries Throttle Body
8a. The throttle-body flange... 
   
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Mazda Bseries Throttle Body
8a. The throttle-body flange was traced from the gasket, cut out of a piece of .25-inch aluminum plate, and then drilled and tapped for the four bolt holes.
Mazda Bseries Flange
8b.
Mazda Bseries Engine
9. The throttle body was placed... 
   
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Mazda Bseries Engine
9. The throttle body was placed in the correct position, then the flange was welded to the rest of the intake plenum.
Mazda Bseries Slug
10a. A reinforcing slug was... 
   
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Mazda Bseries Slug
10a. A reinforcing slug was welded, drilled, and tapped for the intake air-temperature sensor located at the bottom of the new intake plenum.

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