Ultimate Sync
Dual Quad EFI Systems with Offenhauser Cross Ram Intake systems

Description

Ultimate Sync Dual Quad EFI System

Small Block Chevy | Offenhauser Cross Ram Intake

The Ultimate Sync Dual Quad EFI System combines iconic dual quad styling with modern self learning EFI performance for Small Block Chevy engines. Developed by FiTech Fuel Injection in collaboration with Offenhauser, this system delivers classic 2×4 Cross Ram appearance with the drivability, control, and reliability of a fully sequential EFI system.

At the heart of the system is an authentic Offenhauser Cross Ram intake paired with dual Classic style throttle bodies, creating a visually striking setup that performs as good as it looks. FiTech’s external ECU with full timing control manages fuel and spark precisely, while dual wideband oxygen sensors continuously monitor air fuel ratios for accurate self tuning in real time.

Designed for performance street and strip builds, the Ultimate Sync Dual Quad system provides smooth idle, crisp throttle response, and excellent drivability while supporting naturally aspirated, boosted, or nitrous assisted combinations. Each system includes the ECU, main harness, intake manifold, dual throttle bodies, custom dual quad linkage, and required sensors for a clean and complete installation.

This system is E85 compatible, boost and nitrous capable, and requires a Dual Sync Hall Effect distributor for proper operation. Transmission control is not included.

Every Ultimate Sync EFI system is backed by FiTech’s industry leading 3 Year Limited Warranty.

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Horsepower Options and Key Differences

500 HP Configuration

• Supports mild street builds up to 500 horsepower

• 36 lb/hr fuel injectors

• Ideal for cruisers, resto mods, and traditional hot rod applications

• Focused on smooth drivability and easy tuning

750 HP Configuration

• Supports performance street and strip builds up to 750 horsepower

• 55 lb/hr fuel injectors

• Increased fuel capacity for higher compression or moderate power adders

• Maintains excellent street manners with added top end capability

1000 HP Configuration

• Supports high output builds up to 1000 horsepower

• 80 lb/hr fuel injectors

• Designed for aggressive naturally aspirated or boosted combinations

• Maximum airflow and fuel delivery for serious performance applications

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Common Features Across All HP Options

• External ECU with full timing control

• Dual wideband O2 sensors

• Offenhauser Cross Ram dual quad intake included

• Custom dual quad linkage included

• 3 Bar TMAP sensor

• Fan control and A/C input

• Pro tuning laptop software

• Boost and nitrous compatible

• E85 compatible

• Requires Dual Sync Hall Effect distributor

• Transmission control not included

Dual Sync HE distributor required. FiTech #99565 sold separately.