Whipple GM Big Block 671 Blower Intake Manifold

WHIPPLE GM BIG BLOCK 671 BLOWER INTAKE MANIFOLD

The Whipple GM Big Block 671 Blower Intake Manifold is a highly versatile manifold platform for marine and competition-use GM big block forced-induction applications. Designed around a modular 671-based layout, this manifold gives engine builders a flexible foundation for Whipple twin-screw, Quad Rotor, and roots-style supercharger combinations.

The manifold is compatible with Whipple 3.3L, 3.8L, 4.0L, 4.5L, 5.0L, 8.3L, and Quad Rotor superchargers. With the proper billet adapter plate, the 671 bolt pattern can also support 671 through 1471 roots-style superchargers from manufacturers such as B&M and Weiand.

Cast from high-strength A356-T6 aluminum, the manifold is available in standard deck (9.8") and tall deck (10.2") configurations. The modular three-piece design allows the manifold to be configured for non-intercooled use, Standard CuNi marine intercooler cores, or MOAC CuNi marine intercooler cores depending on the engine package, cooling requirement, and installation layout.

The optional Whipple marine intercooler configurations are built around cupronickel core technology for harsh marine environments. CuNi intercooler cores are commonly used in marine applications because the water passages offer corrosion resistance in brackish and saltwater environments, while copper-alloy air fins support efficient heat transfer.

This manifold can also be configured with manifold finish, supercharger adapter plate, and thermostat housing options to better match the build. Finish options include natural, gloss black, Mercury Racing Blue, polished, and custom color configurations. Adapter options support common 671-871, 1071-1471, B&M, and Weiand blower layouts, while thermostat housing options are available for compatible marine plumbing setups.

The low-profile Whipple cooler design works with both intercooler options and supports optional billet adapter plates machined from 6061-T6 aluminum. These adapters feature an 8 inch wide opening for effective airflow distribution while maintaining a compact 1.5 inch height. The 671 bolt pattern can also be adapted for turbocharged or centrifugal supercharger systems using custom adapters.

For fuel-injected Whipple 3.3L, 3.8L, 4.0L, 4.5L, 5.0L, 8.3L, and Quad Rotor applications using the standard intercooler, a 1 inch billet spacer is required to provide proper distributor clearance.

Key Features:

• Universal GM big block 671-based blower manifold for marine and competition-use applications
• Compatible with Whipple 3.3L, 3.8L, 4.0L, 4.5L, 5.0L, 8.3L, and Quad Rotor superchargers
• Supports 671 through 1471 roots-style blowers with applicable adapter plates
• Modular three-piece design for flexible forced-induction configurations
• Available in standard deck (9.8") and tall deck (10.2") versions
• Configurable for non-intercooled, Standard CuNi, or MOAC CuNi intercooler setups where applicable
• Marine cupronickel intercooler options support corrosion resistance in harsh marine environments
• Optional manifold finish configurations available
• Optional 6061-T6 billet adapter plates with 8 inch opening and 1.5 inch height
• Optional thermostat housing configurations available for compatible marine plumbing layouts
• 671 bolt pattern can be adapted for turbocharged or centrifugal supercharger systems
• Standard intercooler Whipple fuel-injected applications require a 1 inch billet spacer for distributor clearance

Application note: This manifold is intended for race and marine applications only. Verify deck height, supercharger type, adapter plate, intercooler configuration, thermostat housing, distributor clearance, and complete installation requirements before ordering.