670CFM Marine Carb w/ Electric Choke

The Holley 670CFM Marine Carb with Electric Choke is a purpose-built four-barrel carburetor engineered for marine and automotive applications demanding reliable fuel atomization and smooth throttle response. This square-bore design delivers 670 cubic feet per minute of air flow, making it ideal for mid-range engines that require balanced performance without excessive fuel consumption. Built by Holley—a leader in carburetor technology for over 70 years—this marine-grade unit addresses the unique challenges of saltwater and freshwater engine environments where corrosion resistance and consistent cold-start performance are non-negotiable.

Constructed from gray anodized aluminum, this 670CFM carb resists oxidation and weathering far better than bare metal alternatives, critical for marine installations exposed to moisture and salt spray. The integrated electric choke automatically enriches the fuel mixture during cold starts, eliminating manual priming and the guesswork of idle adjustment in variable water temperatures. Dual inlet ports and vacuum secondary design allow smooth progression from idle through mid-range cruising, while the square-bore configuration ensures compatibility with a wide range of intake manifolds and adapters. At 9.35 pounds and compact enough to fit standard engine bays (11 x 8 x 12.5 inches), installation requires minimal fabrication on most platforms.

Marine mechanics and boat engine rebuilders benefit most from this carb's durability and low maintenance profile, especially when upgrading tired OEM units on vintage or modern platforms. The vacuum secondary design prevents bogging during light-load operation, keeping fuel economy reasonable while providing adequate fuel delivery under harder acceleration. Installation on dual-inlet applications demands proper fuel line routing and regulator setup; marine applications typically run slightly higher fuel pressure than automotive equivalents to combat vapor lock in engine compartments. Compatibility spans stock marine blocks, vintage hot-rod engines, and custom builds where vacuum-operated secondary control improves driveability over mechanical primaries.