BSA A65 A70 Black Diamond Oversized Intake Valve 1.659"

1 Review(s)
SKU MAP9187
SKU MAP9187
Manufacture MAP Cycle

Universal Fit - review specifications carefully

Product description

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.

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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Questions

1

Reviews

1
These valves flow really well.
Mark Parker,
These valves are nice. I had reservations about the swirl pattern finish so polished it off when I was trying to get flow out of the port I was modifying.
However after getting a small 32mm oval port to 155CFM @ 28"W @ .350" lift, (according to my bench) I thought I'd put the other 'as it came' valve in to see the difference. I figured the less smooth texture would reduce flow. But to my surprise the result was 158CFM @ .398" lift. The port shape makes a huge difference in these heads but a badly shaped valve can kill it. These valves are great.

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