Retno Weber 48 IDA Complete Quad Carburetor Intake Manifold System – SBC Chevy | 10° Angled Runners | Lola Can-Am, Corvette Grand Sport & Chaparral Style

Retno Weber 48 IDA Complete Intake Manifold System – Small Block Chevy (SBC)

Chaparral-Inspired Racing Heritage | Precision Engineering | Low-Profile 10° Angled Runners

Bring legendary Can-Am racing engineering to your Small Block Chevy with the Retno Weber 48 IDA Complete Quad Carburetor Intake Manifold System. Inspired by the exceptionally rare Chaparral intake manifold developed by Jim Hall, this precision-manufactured reproduction combines historic racing design with modern improvements in strength, construction, and functionality.

Designed for Small Block Chevy (SBC) racing applications, including Lola Can-Am race cars, Corvette Grand Sport builds, and other vintage performance vehicles, this complete induction system features four Retno 48 IDA downdraft Weber-style carburetors mounted on a specially engineered intake manifold with 10-degree angled runners.

The angled runner configuration is specifically designed to accommodate restricted hood and hood scoop clearances while maintaining the distinctive appearance and performance potential of a classic quad-carburetor racing setup.

Historic Chaparral Design – Refined by Retno

The original Chaparral intake manifold was developed using the intake baseplate from a 1963–1964 Corvette fuel injection system, modified with individual runners to accommodate four Weber 48 IDA downdraft carburetors.

Retno has faithfully reproduced this rare racing configuration while incorporating important engineering improvements to enhance structural integrity, precision, and durability.

Key Manifold Features:

• 10° Angled Intake Runners: Specially designed to provide additional clearance beneath low-profile hoods and racing hood scoops.

• Improved Manifold Construction: Reinforced mounting areas and an additional third mounting stud for increased strength.

• Precision Port-Matched Runners: Carefully matched intake ports for improved airflow consistency.

• Chaparral-Inspired Design: Reproduces the distinctive quad-carburetor induction arrangement associated with Jim Hall's historic Can-Am race cars.

• Small Block Chevy Compatibility: Designed for SBC applications, including 283, 327, 350, and 400 engines.

Retno 48 IDA Downdraft Carburetors

Each complete system includes four Retno 48 IDA downdraft carburetors, precision-manufactured reproductions of the legendary Weber 48 IDA design.

Manufactured using premium materials and advanced machining processes, these carburetors incorporate several improvements while retaining the appearance and mechanical characteristics of the early original Weber units.

Carburetor Features:

• Four Retno 48 IDA downdraft Weber-style carburetors.

• Precision-machined components and high-quality construction.

• Dichromate protective finish.

• Teflon-coated throttle shafts.

• Brass floats.

• Third idle progression hole.

• Stud-mounted upper carburetor components, replicating the construction of early original Weber carburetors.

• Custom jetting, air corrector, and emulsion tube configurations available.

Every system reflects Retno's commitment to exceptional craftsmanship, functionality, and reliable performance.

Low-Profile Design – 10° Angled Runners

Engineered specifically for applications with limited hood clearance, the manifold's angled runners reduce the overall height of the induction system, making it an excellent choice for Corvette Grand Sport, Lola Can-Am, and other vintage racing applications.

Available Velocity Stack Configurations:

• 1.50" Velocity Stacks: Approximately 10" total system height.

• 2.50" Velocity Stacks: Approximately 11" total system height (configuration shown).

• 3.50" Velocity Stacks: Available upon request.

Overall height is measured from the bottom of the intake manifold to the top of the velocity stack screens. Please verify clearance before ordering.

Complete Intake System – What's Included

This is a complete quad-carburetor induction assembly, supplied with the essential components installed for a coordinated and professional setup.

Included Components:

• (1) Retno Chaparral-style SBC intake manifold with 10° angled runners.

• (4) Retno 48 IDA downdraft carburetors.

• Complete throttle linkage assembly.

• Braided stainless steel fuel lines.

• AN-6 red and blue anodized fuel fittings.

• Fuel pressure regulator.

• Fuel pressure gauge.

• CNC-machined aluminum velocity stacks.

• Stainless steel velocity stack screens.

• Installed fuel delivery lines and linkage components.

The system is supplied assembled with the selected velocity stack configuration. Final installation adjustments and carburetor tuning may be required for your specific engine.

Standard Carburetor Configuration

Unless otherwise specified, the carburetors are supplied with the following standard setup:

Custom carburetor calibration is available upon request. Final jetting requirements may vary depending on engine displacement, camshaft, compression ratio, and intended application.

Custom Configurations & Special Orders

Retno offers custom carburetor configurations to meet the requirements of individual racing and performance applications.

Available Customization Options:

• 1.50", 2.50", or 3.50" velocity stacks.

• Custom main jet sizes.

• Custom idle jet sizes.

• Custom air corrector sizes.

• Custom emulsion tube configurations.

• Carburetor setup tailored to specific engine requirements.

For custom configurations, please submit your specifications through our SOS (Specialty Order Shop) contact form or contact Retno directly before placing your order.

Custom Setup Lead Time: Please allow approximately 7–10 business days for custom configurations.

Vehicle & Engine Applications

Small Block Chevy Engine Applications:

• Chevrolet 283

• Chevrolet 327

• Chevrolet 350

• Chevrolet 400

Ideal Racing & Performance Applications:

• Lola Can-Am race cars.

• Chevrolet Corvette Grand Sport.

• Chaparral-inspired racing restorations.

• Vintage Can-Am and historic road racing vehicles.

• Custom Small Block Chevy racing engines.

• Performance applications requiring reduced hood scoop clearance.

Fitment depends on engine configuration, cylinder head compatibility, installation requirements, and available hood clearance.

Retno – Preserving Legendary Racing Technology

At Retno, we take pride in reproducing some of the rarest and most exceptional components from motorsport history. By combining historically inspired designs with premium materials, precision machining, and carefully engineered improvements, we deliver specialty racing components built with quality and functionality in mind.

The Retno/Weber 48 IDA Complete Quad Carburetor Intake System represents the craftsmanship, innovation, and racing heritage of the legendary Can-Am era.

For custom configurations, specialized engine applications, or additional information, please contact Retno through our SOS inquiry form.