Small Block Chev 305 327 350 400 Dual Plane Intake Manifold

Overview

Early Small Block Chev Classic Dual Plane Intake Manifold, finished in natural cast, engineered to deliver a steady air-fuel flow from idle to 5500 RPM for carburetted engines. The dual-plane configuration helps optimize distribution for enhanced throttle response and mid-range performance, while the spread bore carburettor pad accepts aftermarket square-bore carburettors with both manual and electric choke options.

Key Features

• Fits Small Block Chev engines from 262 to 400 cubic inches
• Idle to 5500 RPM operating range
• Dual-plane design for improved throttle response and mid-range power
• Spread bore carburettor pad accepts aftermarket square-bore carburettors
• EGR equipped; compatible with exhaust emissions components
• EGR block-off plate and gasket included if emissions components are not required
• Special adapter bushings included to fit later model heads (1987–1995); angled or straight versions to accommodate accessories
• Adapter plate converts spread bore to square bore carburettor base
• Most installations accommodate late-model water necks, air conditioning, alternator and HEI ignition systems

What's Included

• EGR block-off plate
• Gasket
• Adapter bushings (angled and straight)
• Adapter plate for square-bore carburettor

Why This Manifold Stands Out

Designed for classic small-block Chevy builds, this intake manifold blends a proven dual-plane design with practical adaptation options. It enables use of modern square-bore carburettors while offering emissions flexibility via the included EGR components. The optional bushings and adapters provide versatile mounting for late-heads and common under-hood accessories, all while preserving a clean, timeless under-hood appearance and reliable performance for street and builder-grade applications.