BBK 1534 Twin 52mm Power Plus Throttle Body for 85-88 Camaro/Corvette/Firebird

Vehicle Fitment

• 1985-1988 Chevrolet Camaro (5.0L V8 305 TPI, 5.7L V8 350 TPI)
• 1985-1988 Chevrolet Corvette C4 (5.0L V8 305 TPI, 5.7L V8 350 TPI)
• 1985-1988 Pontiac Firebird (5.0L V8 305 TPI, 5.7L V8 350 TPI)

Fitment Notes

• Fits GM Tuned Port Injection (TPI) applications only - not compatible with carbureted or non-TPI fuel injection setups.
• CARB Approved for legal use in all 50 states - CARB E.O. Number D-245-15.
• No tune required - works with the factory ECU and stock calibration.
• TPS Voltage Target: 0.54v at Key On (connector middle wire, idle position).

Features

• Twin 52mm throttle body bores deliver up to 30% improved airflow over the restrictive factory unit for gains of 7-12 RWHP.
• CNC machined from high-quality 356 aluminum castings for precise OEM-quality fit and long-term durability.
• OEM-style die-stamped throttle linkages ensure smooth, consistent pedal feel and factory drivability.
• Double-sealed bearings and O-ringed throttle shafts eliminate air leaks and extend service life.
• Direct bolt-on replacement - no modifications required for a hassle-free install.
• Natural aluminum finish for a clean, show-quality engine bay appearance.
• Designed and manufactured in the USA by BBK Performance.
• Backed by BBK's 1-Year Limited Manufacturer's Warranty.

Specifications

• Throttle Body Style: Twin Blade (Dual Bore)
• Bore Size: 52mm x 2
• Material: 356 Cast Aluminum
• Finish: Natural (Uncoated Aluminum)
• Injection Type: Tuned Port Injection (TPI) - Multi-Port Fuel Injection (MPI)
• TPS Sensor Included: No
• IAC Motor Included: No
• Fuel Injectors Included: No
• CARB Status: Approved - E.O. D-245-15 (Legal in all 50 states)
• Warranty: 1-Year Limited Factory Warranty

Included Components

• 1x Twin 52mm Power Plus Throttle Body Assembly
• 1x Set of Required Gaskets
• 1x Installation Hardware Kit

Product Description

The BBK 1534 Twin 52mm Power Plus Throttle Body is a direct-fit performance upgrade engineered specifically for 1985-1988 GM Tuned Port Injection (TPI) applications including the Camaro, Corvette, and Firebird with 305 or 350 V8 engines. By replacing the restrictive factory throttle body with twin 52mm bores, this BBK unit delivers up to 30% more airflow, translating to 7-12 rear-wheel horsepower gains along with noticeably sharper throttle response and improved acceleration throughout the RPM range.

Built from high-quality 356 aluminum using state-of-the-art CNC machining, the BBK 1534 is a true bolt-on replacement that installs without modification and requires no ECU tune. OEM-style die-stamped throttle linkages, double-sealed bearings, and O-ringed throttle shafts maintain factory drivability while significantly improving engine breathing. CARB approved (E.O. D-245-15) and legal in all 50 states, this throttle body is ideal for enthusiasts looking to extract more performance from their classic GM muscle car without sacrificing emissions compliance or daily drivability.