fits model: Lt1, Twin, Camaro, Corvette, Firebird. make: Pontiac.

( Brand: Bbk Performance Parts ), ( Manufacturer Part Number: 1542 ), ( Part Type: Throttle )
This is a high-performance throttle body designed specifically for 350-5.7L engines, commonly found in classic Pontiac Camaros, Corvettes, Firebirds, and LT1 models. This throttle body boasts a twin 52-58mm bore size, which significantly increases the airflow capacity, allowing for more powerful engine performance and improved throttle response.
The throttle body is manufactured with precision and attention to detail, ensuring a perfect fit and seamless integration with your engine. It features a high-quality, durable construction, with a corrosion-resistant finish that will stand up to even the harshest driving conditions.
This performance throttle body is designed to work with electronic fuel injection systems, and comes equipped with a built-in idle air control valve (IACV) for precise idle control. It also includes a throttle position sensor (TPS) for optimal engine management and fuel efficiency.
Installing this throttle body is a straightforward process, and it comes with all necessary hardware and installation instructions. With this throttle body, you can give your classic muscle car the performance boost it needs to keep up with modern traffic and demand more power from your engine. Upgrade to this 350-5.7L bbk throttle body and take your classic Pontiac, Corvette, Firebird, or LT1 to the next level.
Pros of buying a 350-5.7L BBK Throttle Body Twin 52-58mm for Pontiac Camaro, Corvette, Firebird, and LT1:1. Improved throttle response: The BBK throttle body can provide a noticeable improvement in throttle response, making your car feel more responsive and powerful.
2. Increased airflow: The larger 52-58mm throttle body allows for more airflow to enter the engine, which can help improve performance and fuel efficiency.
3. Easy installation: The throttle body is designed to be easy to install, and it comes with all the necessary hardware and instructions.
4. Durable construction: The throttle body is made of high-quality materials and is designed to withstand the rigors of performance driving.
Cons of buying a 350-5.7L BBK Throttle Body Twin 52-58mm for Pontiac Camaro, Corvette, Firebird, and LT1:1. Expensive: The BBK throttle body is a premium product and can be quite expensive compared to stock throttle bodies.
2. Potential compatibility issues: While the throttle body is designed to fit most LT1 engines, there may be some compatibility issues with specific engine configurations or aftermarket modifications.
3. Requires tuning: To ensure proper operation and to fully realize the performance benefits of the BBK throttle body, it may be necessary to have your car tuned by a professional.
Conclusion: If you're looking to improve the performance of your LT1-powered Pontiac Camaro, Corvette, Firebird, or any other compatible vehicle, the 350-5.7L BBK Throttle Body Twin 52-58mm is a solid choice. Its improved throttle response, increased airflow, and easy installation make it a worthwhile investment. However, keep in mind that it is a premium product with a corresponding price tag, and there may be compatibility issues or tuning requirements to consider.
Recommendation: If you're serious about improving the performance of your LT1 engine, we recommend purchasing the 350-5.7L BBK Throttle Body Twin 52-58mm. Just be sure to do your research and consider any compatibility issues or tuning requirements before making the purchase.
I think its on the bigger end like a 56 or 58 but m not positive. Comes with bolts, the 4 bolts needed. Up for sale is a Bbk power-plus throttle body out of 1997 z28, it works good no issues, its anywhere between 52mm to 58mm.
As stated above I m not sure what size it is.