BBF S/D 1.750in Exhaust Valves

The MANLEY BBF S/D 1.750in Exhaust Valves are precision-engineered components designed for serious big-block Ford engine builders and high-performance enthusiasts seeking maximum flow and durability. These valves are essential for anyone building a stroker or nitrous-equipped BBF engine where stock valve geometry simply won't cut it. Whether you're assembling a street strip monster or a dedicated competition engine, the 1.750-inch head diameter delivers the flow characteristics necessary to support aggressive cam timing and boost levels.

MANLEY's S/D (Super Duty) design combines premium alloy steel construction with a tapered stem profile that reduces friction and promotes consistent sealing across the RPM range. The 1.750-inch diameter provides optimized flow characteristics for big-block cylinder heads, allowing improved scavenging and charge evacuation without sacrificing valve seat integrity. The tapered stem design minimizes parasitic losses from piston-to-valve contact and reduces overall inertial loading, critical considerations when running high-lift camshafts or multi-stage nitrous systems.

Each valve is manufactured to exacting tolerances and heat-treated to withstand extreme temperature and pressure cycling. These valves are ideal for big-block Ford applications, particularly in competition environments or high-displacement street builds where exhaust scavenging is crucial for performance.