Triumph Twins Black Diamond 1.44" Exhaust - Intake Valve

Race-proven durability!

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.

• 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.

NOTE: These exhaust valves are extremely close to the same profile as the standard, factory, original equipment intake valve for many models and only require a .060" spring cup shim to be used as an intake valve. This shim (part #vs060) is available though MAP.

FITS:

• Fits 1949-62, 6T Thunderbird (intake and exhaust)
• 1954-57 T110 Tiger and TR6 Trophy (exhaust);
• 1959-63 T120 Bonneville (exhaust)
• 1964-83 650cc and 750cc twins from engine #DU5825 (exhaust).
  

Oversized Valves Are Available From MAP Cycles, Inc.

• 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