Updates to the 2006 L32



2006 model year summary

  1. • Supercharger gasket revised
  2. • Intake manifold revised
  3. • Composite rocker cover added
  4. • Catalytic converter size and substrate composition optimized
  5. • Front cover revised for new water pump
  6. • Rod and crankshaft bearings changed to lead-free

Full descriptions of new or changed features

Supercharger gasket revised

An aluminum gasket carrier is added to better seal the supercharger assembly, reducing emissions.

Intake manifold revised

Upgraded side gaskets for the intake manifold and a laser-welded purge valve reduce noise.

Composite rocker cover

The rocker arm covers are changed to a stronger, more durable composite material for high-ileage durability.

Catalytic converter size and substrate composition optimized

A larger volume converter with a revised mixture of precious metals is added to further reduce emissions.

Front cover revised for new water pump

A new water pump with more robust gaskets is incorporated into the front cover of the engine to increase high-ileage reliability.

Rod and crankshaft bearings changed to lead-free

As part of an ongoing effort to eliminate toxic materials in powertrain products, the bearings have been replaced with materials free of lead.


GM’s 3800 is to V-6 engines what the original Chevrolet small block is to the V-8. The Series III enhances the 3800’s reputation as a competitive and contemporary engine, with output, efficiency and emissions levels that meet or beat overhead-cam engines. And it does so with superior low-end response.

Since the first 3800 was introduced by Buick, more than 25 million have been built, and its configurations and technology have continuously evolved. Both the enthusiast and business press have raved about the 3800; it has been selected as one Ward’s Auto World’s Ten Best Engines in the World three different times, as well as named being named to several lists in 2000 as one of the best engines of the 20th century.

The 3800 Series II V-6 was first supercharged for the Buick Park Avenue Ultra. The result was output and performance comparable to competitive V-8s, with the efficiency of a V-6. The durable, highly refined design of the standard 3800 allowed most major engine components, including block, crankshaft and cylinder heads, to be used for the supercharged variant without modification.

The 3800 Series III, launched in 2004, was developed with several goals: improve quality, performance and flexibility; reduce noise, vibration and harshness, as well as cost of ownership; and deliver contemporary features such as electronic throttle control. Each goal has been achieved. Moreover, these objectives were achieved without reducing fuel economy or increasing unit cost.

The L32 is available in the Pontiac Grand Prix GTP.

The following represent key features of the 3800 Series III SC:

  1. • Bending braces for powertrain

  1. • Structural cast aluminum oil pan
  1. • Oil pan seal
  1. • Eaton Gen V supercharger
    1. • Improved air flow through larger tuned inlet port and larger, less restrictive outlet port. The net result is a 7 percent improvement in volumetric efficiency
    2. • More efficienct supercharger that requires 9 percent lower rpm to deliver same air flow and a 13-percent reduction in the power required to spin the supercharger
    3. • APC Teflon-like coating allows for tighter tolerances resulting in minimal leakage. This change allowed GM engineers to change the fuel requirement from "Premium fuel required" to "Premium fuel recommended."
    4. • PO5 powertrain control module (PCM)

  1. • Electronic throttle control (ETC)
  1. • Powdered metal connecting rods
  1. • Returnless fuel injection

  1. • Damplator vibration balance
  1. • Direct-mount air conditioning compressor
  1. • Ultra-fast oxygen sensors
  1. • Single close-coupled catalytic converter