This manual provides comprehensive instructions for converting the Porsche 928 from its original 16-valve engine configuration to a 32-valve (4 valves per cylinder) specification. The Porsche 928, produced from 1977 to 1995, is renowned for its sophisticated engineering, powerful V8 engine, and grand touring capabilities. This conversion aims to significantly enhance performance, offering a substantial increase in horsepower and torque, bringing it closer to the capabilities of the later 32-valve GTS models. The original engine family is the Porsche V8, with displacements ranging from 4.5L to 5.0L in its 16-valve forms.

This technical conversion guide is designed for experienced mechanics and Porsche enthusiasts undertaking the complex task of upgrading the engine's cylinder heads and associated components. It covers critical procedures including cylinder head modification, valve train assembly, camshaft installation, and engine management system adaptation for the 32-valve setup. The manual details disassembly and reassembly steps, component identification, timing procedures, and troubleshooting common issues that may arise during this advanced engine modification. Its purpose is to facilitate a successful conversion, maximizing the performance potential of the Porsche 928.

This manual provides comprehensive instructions for converting the Porsche 928 from its original 16-valve engine configuration to a 32-valve (4 valves per cylinder) specification. The Porsche 928, produced from 1977 to 1995, is renowned for its sophisticated engineering, powerful V8 engine, and grand touring capabilities. This conversion aims to significantly enhance performance, offering a substantial increase in horsepower and torque, bringing it closer to the capabilities of the later 32-valve GTS models. The original engine family is the Porsche V8, with displacements ranging from 4.5L to 5.0L in its 16-valve forms.

This technical conversion guide is designed for experienced mechanics and Porsche enthusiasts undertaking the complex task of upgrading the engine's cylinder heads and associated components. It covers critical procedures including cylinder head modification, valve train assembly, camshaft installation, and engine management system adaptation for the 32-valve setup. The manual details disassembly and reassembly steps, component identification, timing procedures, and troubleshooting common issues that may arise during this advanced engine modification. Its purpose is to facilitate a successful conversion, maximizing the performance potential of the Porsche 928.