Speedmaster PCE273.1017

Speedmaster PCE273.1017 is a set of eight stainless steel exhaust valves for selected Chevrolet Big Block V8 cylinder heads. The valves use a 1.880 in head, standard 11/32 in stem and an undercut, swirl-polished design intended to improve exhaust flow.

Application / fitment

The set is for Chevrolet Big Block heads prepared for 1.880 in exhaust valves, 11/32 in stems and 5.422 in overall length. Confirm the exact cylinder-head dimensions because 1.900 and 1.940 in valves and extended-length versions are also available.

• part type: exhaust 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 1.880 in valve head and 11/32 in stem
• length version: standard, not +0.100 in
• dimensions: 1.880 in / 47.75 mm head; 11/32 in / 8.73 mm stem; 5.422 in / 137.72 mm overall length

Inspect the guides, exhaust seats, concentricity and seat-contact width before installation. Because exhaust valves operate at high temperature, also verify spring condition and valve-tip height. Check piston-to-valve clearance after cylinder-head machining.

Technical information

• part type: stainless steel exhaust valves
• valve head diameter: 1.880 in / 47.75 mm
• valve stem diameter: 11/32 in / 0.344 in / 8.73 mm
• overall length: 5.422 in / 137.72 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
• position: exhaust
• sale unit: 1 set / 8 valves