08/17/2025
Legendary Engines: 302 Small Block Chevy:
Built meticulously for the SCCA 5.0 Liter Trans Am Competition Rules, the OG '67 Z/28 302 Small Block Chevy is a masterpiece of engineering and performance.
This high-winding small block wasn’t just built for show—it was crafted to dominate both on the track and off, and it succeeded admirably.
Precision Engineering Within SCCA Trans Am Rules
To compete in the SCCA 5.0 Liter Trans Am series, the Z/28 302 had to adhere to stringent regulations that governed everything from displacement to component specifications.
The 302 cubic inch (4.9L) displacement was the sweet spot for maximizing performance while staying within the 5.0-liter limit. Engineers focused on optimizing the engine’s architecture to ensure compliance without compromising power or reliability.
Key modifications included:
Camshaft Selection: A high-performance camshaft was chosen to enhance valve timing and lift, ensuring efficient airflow and combustion within the rules.
Cylinder Heads: Lightweight, high-flow cylinder heads were installed to improve breathing, essential for maintaining power across the rev range.
Ignition System: A high-energy ignition system was used to ensure consistent and powerful spark delivery, crucial for high-performance applications.
Cooling Solutions: Enhanced cooling systems, including upgraded radiators and oil coolers, were integrated to maintain optimal engine temperatures during intense racing conditions.
Redline and Performance Characteristics
The Z/28 302 was renowned for its impressive redline, typically reaching up to 6,500 RPM. This high-revving capability was a significant advantage on the track, allowing drivers to extract maximum power and torque during crucial racing moments. The engine's ability to maintain stability and performance at elevated RPMs made it a formidable contender in the Trans Am series.
