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BSA A65 A70 Black Diamond Oversized Intake Valve 1.659"

BSA A65 A70 Black Diamond Oversized Intake Valve 1.659" MAP9187

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  • BSA A65 A70 Black Diamond Oversized Intake Valve 1.659" MAP9187
  • BSA A65 A70 Black Diamond Oversized Intake Valve 1.659" MAP9187
  • BSA A65 A70 Black Diamond Oversized Intake Valve 1.659" MAP9187
BSA A65 A70 Black Diamond Oversized Intake Valve 1.659"
We only have 3 left in stock
We only have 3 left in stock
$29.95
This high performance, oversized (1.659" face diameter), intake 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 MAP9187
Manufacture MAP Cycle
Additional Information

Additional Information

SKU MAP9187
Manufacture MAP Cycle
Reviews

Customer Reviews 1 item(s)

These valves flow really well.
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. Review by Mark Parker / (Posted on 8/21/2017)

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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
Product Question

Product Questions

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Are these valves also for stock BSA 650 motors? I want to use them only because my intake seats are worn a little deep? Can I use my stock keepers?
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