Enginetech ST181221N Engine Valve Seat 1.500 ID x 1.8175 OD

The Enginetech ST181221N is a replacement engine valve seat designed for cylinder head rebuilding on 1988–1997 Ford F-350 applications. Valve seats are precision-machined hardened metal rings that are pressed into the cylinder head to form the critical sealing surface between the valve face and the head, maintaining combustion chamber airtightness and transferring heat away from the valve.

Key Specifications:

• Inner Diameter (ID): 1.500 in.
• Outer Diameter (OD): 1.8175 in.
• Height/Width: 0.210 in.
• Seat Angle: 45 degrees
• Material: Nickel alloy ("N" suffix designation)

About Enginetech Valve Seats:

Enginetech valve seats are manufactured to exacting specifications using precision machinery, ensuring consistent dimensions and a reliable press fit into the cylinder head bore. Enginetech products are manufactured in facilities operating under ISO, QS, and TS quality systems, making them a trusted choice for professional engine rebuilders and automotive machine shops.