What is a 302 Chevy engine?
The 302 Chevy engine is a legendary small-block V8 engine that holds a special place in automotive history. Known for its performance and racing pedigree, this engine was specifically designed by Chevrolet to dominate the Trans-Am racing series in the late 1960s. In this article, we’ll explore the history, specifications, and unique features of the 302 Chevy engine, as well as why it remains a favorite among car enthusiasts today.
The History of the 302 Chevy Engine
The 302 Chevy engine was introduced in 1967 as part of Chevrolet's first-generation Camaro Z/28. It was created to comply with the Sports Car Club of America (SCCA) Trans-Am racing regulations, which required engines to have a maximum displacement of 305 cubic inches. Chevrolet engineers achieved this by combining a 4-inch bore from the 327 engine with a 3-inch stroke from the 283 engine, resulting in a 302-cubic-inch displacement.
This engine quickly gained a reputation for its high-revving capabilities and impressive power output, making it a formidable competitor on the track. It was produced from 1967 to 1969 and was exclusively available in the Camaro Z/28 during this time.
Specifications and Features
The 302 Chevy engine was designed with performance in mind, and its specifications reflect this focus. Here are some of the key features:
- Displacement: 302 cubic inches (4.9 liters)
- Bore and Stroke: 4.00-inch bore and 3.00-inch stroke
- Compression Ratio: 11.0:1
- Horsepower: Rated at 290 horsepower, though actual output was closer to 350-400 horsepower in stock form
- High-Performance Components: Forged steel crankshaft, solid-lifter camshaft, and high-flow cylinder heads
- Carburetor: Equipped with a Holley 780 CFM four-barrel carburetor
These features made the 302 Chevy engine a high-revving powerhouse, capable of reaching RPMs well above 7,000, which was ideal for the demands of road racing.
Why the 302 Chevy Engine is Still Popular
Even decades after its production ended, the 302 Chevy engine remains a favorite among car enthusiasts and collectors. Here’s why:
- Racing Heritage: Its success in the Trans-Am series cemented its status as a performance icon.
- Limited Production: The engine was only produced for three years, making it a rare and sought-after piece of automotive history.
- Performance Potential: With its robust design and high-revving nature, the 302 is still a popular choice for vintage racing and performance builds.
- Collector Appeal: Camaro Z/28 models equipped with the 302 engine are highly valued by collectors, further enhancing the engine’s legacy.
Conclusion
The 302 Chevy engine is more than just a small-block V8; it’s a symbol of Chevrolet’s engineering prowess and dedication to performance. Whether you’re a classic car enthusiast, a racer, or simply someone who appreciates automotive history, the 302 Chevy engine is a testament to what makes muscle cars so special. If you ever come across a Camaro Z/28 with this engine, you’re looking at a piece of racing history that continues to inspire awe and admiration.
Frequently Asked Questions
How much horsepower does a 302 Chevy have?
Rated at a very conservative 290 hp and 290 ft-lb of torque, the Chevrolet 302 V8 was actually capable of around 376 hp with some ignition tuning and the installation of the headers that came in the trunks of some Z/28 Camaros. The Chevrolet 302 engine distinguished itself in both road racing and on the drag strip.
Is a 302 a big block?
The Ford Boss 302 (formally the "302 H.O.") is a high-performance "small block" 302 cu in (4.9 L) V8 engine manufactured by Ford Motor Company.
How much horsepower can a 302 get?
Standard Ford 289 and 302 small-blocks were factory-rated between 200 and 230 hp. The vaunted 289 High-Performance engine was said to make 271 hp. Today, if a 302 Ford makes 360 hp on pump gas with a hydraulic cam, most experts consider it to be a pretty good motor-at least until Joe Sherman steps up to the plate.
What is the difference between 302 and 351?
The main difference between the blocks was the Deck Height . The 351 blocks were as much as 1.300 in. taller to allow for a longer Stroke . You can spot the difference pretty easily by looking at the front of the engine.
How much horsepower can you get out of a Chevy 302?
Yes, you can get 500–600 HP from a flat tappet 302 that will run on pump gasoline (91–93 octane). Build the bottom end with forged pistons, rods, and crankshaft. Set the compression ratio to 8.5:1. A pair of aluminum cylinder heads with large valves and ports should be included.
Is a 351 windsor the same as a 302?
The main difference between the blocks was the Deck Height . The 351 blocks were as much as 1.300 in. taller to allow for a longer Stroke . You can spot the difference pretty easily by looking at the front of the engine.
How many years did Chevy make a 302 engine?
Chevrolet did manufacture a 302 engine in 1967, 1968 and 1969. It was available exclusively in the Z/28 Camaro and was developed to meet the SCCA Trans Am rule that engines could be no larger than 305 cubic inches.
How much horsepower does a 302 have compared to a 351?
As a testament to the Boss 302's high-rpm nature, the peak horsepower numbers differed by just 9 hp, but the torque curve tells the real story. Down at 3,100 rpm, the larger Boss 351 offered an additional 90 lb-ft of torque, and carried a sizable advantage all the way through 6,500 rpm.
What is special about the Chevy 302 engine?
By combining the 4.00-inch bore offered by the 327 block with the 3.00-inch stroke of the 283, the 302 offered a rare combination of a big bore for breathing and a short stroke for increased engine speed.
