3310 Metering Block Kit

The Holley 3310 Metering Block Kit (MPN 34-13) is a secondary metering block assembly designed specifically for Holley 4160 carburetor applications. This precision component manages fuel delivery to the secondary circuits, making it essential for carburetors configured for dual-circuit operation. The kit arrives pre-assembled with all necessary gaskets and hardware, streamlining installation for both rebuild projects and performance modifications.

Constructed from aluminum with a chromate finish, the metering block offers corrosion resistance and thermal stability under extended operation. The chromate coating protects against oxidation while maintaining compatibility with fuel and gasoline-based additives. Its compact footprint—7.35 x 1.2 x 10.75 inches—fits the standard mounting configuration for Holley 4160 secondary blocks, ensuring drop-in fitment without modification. The 1.08 lb weight reflects a lightweight, precision-engineered design optimized for consistent fuel metering control without compromising durability.

This kit serves engine builders, carburetor technicians, and performance enthusiasts restoring or upgrading Holley 4160 carburetors on street engines, classic vehicles, and muscle car projects. The secondary metering block is critical for transition smoothness when secondary circuits open under acceleration, preventing bog or hesitation. Complete gasket sets and hardware inclusion eliminates the need for separate sourcing, reducing downtime during carburetor assembly or re-tuning operations.

Holley 4160 carburetors remain among the most popular platforms for vintage and classic engine builds due to their tunability and aftermarket support. Secondary metering blocks are wear-prone components that benefit from periodic replacement to maintain proper fuel distribution and prevent lean conditions that can damage pistons and cylinder walls. This OEM-specification kit ensures faithful fuel curve replication across the RPM band.