Our MAP valves feature black oxide nitrating (a superior hardening process) which penetrates into the ultra-EV8 stainless steel core material, forming a super-hard outer layer. This "Black Diamond" finish adds surface hardness as well as a smoother exterior coating which greatly reduces friction. This reduction in friction allows for tighter tolerances (fit) and provides long-lasting durability.
Stock, standard-sized exhaut valve
These valves are vastly superior to factory valves and other so-called "performance" finishes such as hard chrome.
Our induction welded, heat-treated tip prevents mushrooming and eliminates the need for lash caps.
Oversized Valves Are Available from MAP
Our oversized valves (OS) are flow tested for maximum performance.
Oversized valves can also be used to rejuvenate sunken valve seats while correcting valve geometry.
The OS valve features relocated keeper locations to accommodate hi-lift racing cams and springs. This saves additional machining expense.
NOTE: Always be sure to check piston clearance before installing oversize valves.
Fitment information
BSA Models
BSA A50 Royal Star 1966 - 1970
BSA A50 Wasp 1966 - 1967
BSA B25 Fleetstar 1969
BSA B25 Gold Star 1971
BSA B25 Starfire 1968 - 1970
BSA B25 Trail 1971
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