CP Piston & Ring Set 78-83 Porsche 911SC 3.0L - 95mm Bore - 39cc Dome - Compression Ratio (9.5)

If you're rebuilding the engine in your 1978-1983 Porsche 911SC with the 3.0L flat-six, this forged piston and ring set from CP Pistons is built for serious performance. These pistons are designed to replace your original equipment with a 95mm bore and feature a 39cc dome, which results in a 9.5:1 compression ratio. This is a popular choice for enthusiasts looking to get more out of their air-cooled Porsche engine, whether for street use or track days.

CP Pistons are well-known for their robust construction. These are forged from high-strength aluminum alloy, making them significantly stronger and more durable than cast pistons. This strength is crucial for handling the increased cylinder pressures and temperatures that come with performance engine builds. The set includes the pistons and the necessary rings, all manufactured to precise tolerances to ensure a proper seal and efficient operation. The 39cc dome volume is a specific design choice that helps achieve the 9.5:1 compression ratio, a common target for naturally aspirated performance builds that balances power with pump gas compatibility.

When undertaking an engine rebuild of this caliber, attention to detail is key. Ensure you have all the necessary machine work done on your cylinders to match the 95mm bore of these pistons. This set is designed as a direct replacement for the 3.0L 911SC engine, but always refer to the manufacturer's installation instructions for specific guidance on assembly and break-in procedures. Please note that this part is not CARB approved and cannot be shipped to California.