Procomp PC4322-8

Procomp PC4322-8, now corresponding to Speedmaster PCE273.1023, is a set of eight stainless steel intake valves for selected Chevrolet Big Block V8 cylinder heads. The valves use a 2.250 in head, standard overall length and an undercut, swirl-polished stem designed to improve intake-port airflow.

Application / fitment

The set is for Chevrolet Big Block cylinder heads prepared for 2.250 in intake valves, 11/32 in stems and 5.244 in overall length. Do not select the valves by engine displacement alone because production and performance heads may use different valve diameters and lengths.

• part type: intake valve set
• primary engine family: Chevrolet Big Block V8
• selected displacements: 396 / 6.5 L, 402 / 6.6 L, 427 / 7.0 L and 454 / 7.4 L after cylinder-head confirmation
• production or aftermarket heads machined for a 2.250 in valve head and 11/32 in stem
• length version: standard for PCE273.1023, not the +0.100 or +0.250 in extended versions
• dimensions: 2.250 in / 57.15 mm head; 11/32 in / 8.73 mm stem; 5.244 in / 133.20 mm overall length

Measure the guides and check stem clearance, valve runout and seat-contact width before installation. After seat machining, verify valve-tip height, spring geometry and piston-to-valve clearance. Install the valves as a matched set for all eight prepared intake seats.

Technical information

• part type: stainless steel intake valves
• former Procomp number: PC4322-8
• current Speedmaster number: PCE273.1023
• valve head diameter: 2.250 in / 57.15 mm
• valve stem diameter: 11/32 in / 0.344 in / 8.73 mm
• overall length: 5.244 in / 133.20 mm
• valve-tip length: 0.220 in / 5.59 mm
• material: stainless steel
• stem design: undercut
• finish: swirl-polished
• stem tip: hardened
• lock groove: single conventional groove
• sale unit: 1 set / 8 valves