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Storefront >> Air Induction >> Northstar Throttle Body Conversion Kit

Northstar Throttle Body Conversion Kit Price: $589.99
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- 1997-2008 Grand Prix GTP
- 1997-2004 Regal GS
- 2004-2005 Monte Carlo Supercharged SS
- 2004-2005 Impala SS
- 1996-2003 Bonneville SSEi

3800 Performance now offers a Northstar Throttle Body Conversion Kit.

The stock throttle body used on the L67 supercharged engines have a 69mm inside diameter outlet. The stock throttle body used on the Cadillac Northstar V8 engine has a 75mm inside diameter outlet. This 6mm increase in size dramatically increase throttle response and provides solid horsepower gains with customers running a 3.0” or smaller supercharger pulley, and moreso for those with an aftermarket cam or cam/heads package.

This conversion kit is made to match up perfectly to aftermarket larger-bore supercharger housings, which have 75.5mm bored inlets. But for those customers running a stock or stock-bore supercharger housings, which have 72mm inlets, we have a solution for you as well. We offer 2 different adapter plate designs: one adapter plate mates the Northstar 75mm outlet to the stock 72mm SC inlet by tapering the bore for a nice smooth airflow transition, while the second adapter plate mates the Northstar 75mm outlet to the 75.5mm aftermarket supercharger housing inlet with a straight-through bore. With both adapter plates designs, the TB is located to the adapter plate by dowels to ensure a perfect fit and centering of the TB to adapter.

The Northstar Throttle Body Conversion Kit uses a Corvette LS6 Mass Air Flow (MAF) sensor that will need to be tuned in with either custom PCM work, a TechEdge ICCU, or a TechEdge Mini-AFC 2.0. We provide the option below to purchase the TechEdge Mini-AFC 2.0. You MUST have access to a diagnostic scanning tool (such as AutoTap) to monitor your front O2 sensor and LTFT (Long Term Fuel Trim) parameters so that you can adjust the fuel settings for your car. Not doing so could have an adverse affect on your engine and other components which 3800 Performance will not be liable for.

The Northstar Throttle Body Conversion Kit comes COMPLETE with the following components:
  • Northstar Throttle Body (with sensors) and custom alterations to work on an L67 vehicle
  • Custom Adapter Plate (customer chooses tapered-bore or straight-bore design)
  • 85mm LS6 MAF sensor
  • Bellows to connect the TB to the MAF sensor
  • Throttle Position Sensor wiring harness adapter
  • 5-wire to 3-wire MAF sensor wiring adapter and plug for IAT sensor
  • Stainless Steel bolts
  • Stainless Steel Clamps for the bellows
  • Modified throttle cable bracket
  • Northstar TB o-ring gasket
  • RTV for mating the adapter plate to the SC inlet
  • Fitting for EVAP vaccuum line
  • No core charge is needed for this TB kit.
From the very start of the R&D for creating an upgrade throttle body kit for the L67, the goal was to not only provide a high-performance solution, but also to not alter the configuration of the linkage and wiring. That is why we found the Northstar TB to be the perfect choice, as it is already designed for a front wheel drive car and therefore, the linkage is on the proper side of the TB as well as the IAC sensor. And there are no worries of the customer having to splice into your engine wiring harness or having their linkage cables caught up in the engine wiring harness. Also the stock PCV system in NOT blocked with this kit; there are passages in the custom adapter plate so there is no need for a valve cover breather to allow unmetered air into the engine.

Due to the many different air intake configurations on the market, We are not able to include any adaptations for the MAF sensor to your air intake solution. It will be the customer's responsibility to solve this, although 3800 Performance can help assist with finding/figuring out what you will need. We are currently researching an add-on fenderwell solution that will be able to be added on to the Northstar Kit.

- For those customers without an EGR system enabled on their vehicle and are currently using a block-off plate on the lower intake manifold, you will need to let us know. For these customers, we will include, for free, a custom block-off plate for your lower intake manifold, as others will not work with this kit. If you have an intercooler installed though, then this will not a problem.

Select Adapter Plate

Add TechEdge Mini-AFC 2.0


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