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BSA A65 A70 Black Diamond Oversized Exhaust Valve 1.459"

BSA A65 A70 Black Diamond Oversized Exhaust Valve 1.459" MAP9189

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  • BSA A65 A70 Black Diamond Oversized Exhaust Valve 1.459" MAP9189
  • BSA A65 A70 Black Diamond Oversized Exhaust Valve 1.459" MAP9189
  • BSA A65 A70 Black Diamond Oversized Exhaust Valve 1.459" MAP9189
BSA A65 A70 Black Diamond Oversized Exhaust Valve 1.459"
BSA A65 A70 Black Diamond Oversized Exhaust Valve 1.459" is sold out. More are on the way.
BSA A65 A70 Black Diamond Oversized Exhaust Valve 1.459" is sold out. More are on the way.
$29.95

This high performance, oversized (1.459" face diameter), exhaust valve is built using MAP's race-proven, Black Diamond technique. These hard-coated stainless steel valves are far superior to stock valves. Fits 1966-72 A65 and A70 BSA models. Additional information below.

$29.95

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Description

Details

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.

Oversized Valves

  • 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.

FITS:

  • 1966-72 A65 and A70 BSA models.

Additional Information

SKU MAP9189
Manufacture MAP Cycle
Additional Information

Additional Information

SKU MAP9189
Manufacture MAP Cycle
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Fitment Information

BSA Models

  • BSA A65 Firebird 1969
  • BSA A65 Firebird Scrambler 1968 - 1971
  • BSA A65 Hornet 1966 - 1968
  • BSA A65 Lightning 1966 - 1972
  • BSA A65 Spitfire 1966 - 1968
  • BSA A65 Thunderbolt 1966 - 1972
  • BSA A70 Lightning 1971 - 1972
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