Buick GN 1986-1987 Throttle Body

Buick GN 1986-1987 Throttle Body

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High performance throttle body for the Buick Grand National, model years 1986-1987. Replace your Buick GN's restrictive stock throttle body with our top of the line unit and get your engine the air it's lacking.


Better Air Flow for More Power. This upgrade will improve your GN's throttle response and horsepower. It's the perfect starting point for future modifications.

Exceptional Quality. This throttle body is CNC machined from 6061-T6 billet aluminum and the exterior is polished to an eye-catching finish. The shafts are also CNC machined from stainless for durability and quality, with brass blades and the highest quality bushings and screws. Only the best components are used for unparalleled reliability and performance. Manufactured in the USA.

Application. The Accufab throttle body is specifically designed as a direct bolt on for use on the 1986-1987 Buick Grand National 3.8L V6. This throttle body is intended to be used with your OEM linkage, not provided.

Accessories Included. Each Buick throttle body includes a throttle body gasket and mounting hardware.

The optional step hose will attach the 2 ½-inch OEM turbo output tube on the Buick GN to the 3-inch outside diameter 70mm Accufab throttle body. Not required for the Accufab 65mm Buick throttle body.


Buick GN Trivia: In February 1982, the Regal Grand National debuted, which was named for the NASCAR Winston Cup Grand National Series (the "Grand National" term was part of the Cup series nomenclature until 1986).[6] Buick had won the Manufacturers Cup in 1981 and 1982, and wanted to capitalize on its success: "What wins on Sunday, sells on Monday". These 1982 cars were not painted black, which may confuse those not familiar with them. All started out as charcoal gray Regals that were shipped off to a subcontractor for finishing.

Originally intended for a run of 100 units, Cars and Concepts of Brighton, Michigan, retrofitted 215 Regals with the GN package. Most obvious was the light silver gray firemist paint added to each side. Red pinstripes and billboard shadow lettering proclaiming "Buick" were applied. The wheel opening moldings and rocker panel moldings were blacked out using black vinyl tape. Finally, a front air dam and rear spoiler were installed. On the inside, special "Lear-Siegler" seats were installed. These seats are fully adjustable and were covered with silver brandon cloth with black vinyl inserts. The front seat had Buick's "6" emblem embroidered onto them. Also, a special clock delete plate was added to the instrument panel which contained the yellow and orange "6" logo and the words "Grand National Buick Motor Division".)

General Throttle Body Installation Instructions:

Replacing the original throttle body and installing an Accufab throttle body is considered a “bolt-on” modification. In most cases it is an “off with the old and on with the new” process.


In some cases, some minor modifications are required. If, for instance, the new throttle body is larger than the inlet hole in the intake manifold, some minor grinding or chamfering of the inlet hole may be required. On the 1996-1998 Cobra installations, the bridge between the dual-hole intake manifold must be ground or cut out so as to permit the installation of the larger single blade Accufab throttle body. It will be necessary to remove the upper intake manifold lid to accomplish this.


All of these tasks are relatively easy to do, however, if any part of a throttle body installation is thought of as being difficult, or if you are uncomfortable with doing it yourself, we recommend getting advice or consultation from a professional.


In general, here are some generic throttle body installation instructions:
1. Disconnect the ground cable from your battery.
2. Remove the Throttle Position Sensor (TPS) from the original throttle body. If the original throttle body also has an Idle Air Control motor (IAC), remove that too.
3. Remove the original throttle body (typically, four bolts).
4. If the vehicle requires any modifications to the intake manifold, do that now.
5. When that is complete, install the new Accufab throttle body.
6. Then, re-install the IAC and TPS, reconnect the battery cable.
7. 
Click here > to view TPS Adjustment.

Technical Specs
Year 1986-1987
CFM Air Flow 649 CFM, 711 CFM 70mm
Size 65mm or 70mm
Material Aluminum
Finish Polished

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  • Views: 8323
  • Brand: Accufab Racing
  • Product Code: B65
  • Availability: In Stock
  • From ... $339.99

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