Whipple GM Big Block Port Injection 671 Blower Manifold

Whipple Superchargers continues to push the boundaries of performance engineering with the development of a port-injected, modular big block intake manifold designed for maximum flexibility across a wide range of forced-induction applications. Whether you are running a Whipple supercharger, a traditional roots-style blower, or building a custom high-horsepower setup, this manifold provides a robust foundation for extreme power levels.

Cast from high-strength A356-T6 aluminum, the Whipple port-injection big block manifold is available in both standard deck (9.8") and tall deck (10.2") configurations. Its unique three-piece modular design incorporates a low-profile lower manifold capable of supporting either one injector per cylinder or dual injectors per cylinder, allowing precise fuel delivery for high-output and race-focused applications.

The upper adapter features a wide 671-based bolt pattern, making it compatible with nearly any supercharger configuration from 671 through 1471. For larger blower setups, a simple 1/2" adapter plate reduces the opening to the standard 671 size. This same design also allows the manifold to be adapted for turbocharged or centrifugal supercharger applications using a custom adapter, resulting in a compact, low-profile intercooled intake solution.

Whipple engineered this modular system with multiple intercooler options to support a wide range of power levels and duty cycles. The Stage 1 aluminum intercooler core measures 3.25" thick and over 7.85" wide, providing excellent thermal efficiency for automotive and marine applications. Dual -12AN fittings simplify coolant plumbing, while additional sensor ports at the front water passage allow easy integration of boost, temperature, and coolant sensors.

For extreme horsepower applications, Whipple offers a Stage 2 cupronickel intercooler core measuring 5" thick and 7.85" wide. Featuring four internal water passages along with dual inlets and outlets, this core is designed to maintain near-ambient intake temperatures under sustained high boost. Cupronickel construction delivers exceptional strength, corrosion resistance, and longevity, technology Whipple has successfully utilized in marine environments since 2000.

THIS PRODUCT IS INTENDED FOR USE SOLELY ON VEHICLES USED IN SANCTIONED OFF-HIGHWAY OR CLOSED-COURSE COMPETITION AND IS NOT LEGAL FOR USE ON PUBLIC ROADS OR HIGHWAYS, UNLESS OTHERWISE PERMITTED BY SPECIFIC REGULATORY EXEMPTION.

IN THE STATE OF CALIFORNIA, THIS PRODUCT IS LEGAL ONLY FOR RACING VEHICLES THAT MAY NEVER BE USED, REGISTERED, OR LICENSED FOR OPERATION ON A PUBLIC ROAD OR HIGHWAY.

IT IS THE RESPONSIBILITY OF THE INSTALLER AND/OR END USER TO ENSURE THAT THE INSTALLATION AND USE OF THIS PRODUCT COMPLIES WITH ALL APPLICABLE FEDERAL, STATE, AND LOCAL LAWS AND REGULATIONS.

THIS NOTICE APPLIES TO CUSTOMERS LOCATED WITHIN THE UNITED STATES. CUSTOMERS OUTSIDE THE UNITED STATES MUST COMPLY WITH ALL APPLICABLE LAWS AND REGULATIONS IN THEIR COUNTRY OR REGION.