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Manley 11639-8 Stainless Steel Performance Valve

(1999-2004 Ford F-150; 1999-2004 Ford Mustang; 1999-2004 Ford F-250 Super Duty; 1999-2004 Ford F-350 Super Duty; 1999 Ford F-250; 2007-2010 BMW 3 Series)

Part of: Manley Stainless Steel Performance Valves

Other options in this family: Manley 11633-8 Manley 12346-8 Manley 11638-8

Manufacturer

Picture for manufacturer Manley

Part Number

11639-8
14 reviews
Sale Price

$202.55

In Stock (10+)

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Usually delivered within 2 days

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Product Details

The Manley 11639-8 is a premium stainless steel performance valve engineered for demanding automotive applications. Manufactured from Manley's proven Race Series alloy, this valve delivers exceptional flow characteristics and durability even under extreme operating conditions.

Specifications:

  • Head Diameter: 37.0 mm
  • Stem Diameter: 0.2740 inches
  • Overall Length: 4.650 inches
  • Tip Length: 0.470 inches
  • Underhead Angle/Radius: 15° x 1/2 inch
  • Margin: 0.060 inches
  • Seat Width: 0.080 inches
  • Top of Head: 9° Dish
  • Installed Height: Stock
  • Weight: 68 grams

Premium Construction Features:

  • Chrome-plated stems for superior wear resistance and reduced friction
  • Swirl polished underhead for optimized airflow
  • Fully hardened tips for extended service life with aggressive valve train components
  • Completely machined combustion face for precise sealing
  • Controlled margin heights for consistent performance
  • Exact stem-to-seat concentricity for proper valve sealing

Manley's Race Series stainless steel alloy provides outstanding strength and heat resistance, making this valve suitable for applications ranging from performance street engines to high-horsepower race builds. The precision manufacturing process ensures consistent quality and optimal flow characteristics that meet or exceed OEM specifications.

Backed by over 40 years of valve manufacturing expertise, Manley Performance valves are trusted by engine builders and racers worldwide for their reliability and performance in the most demanding environments.

Products specifications

Fits

1999-2004 Ford F-150; 1999-2004 Ford Mustang; 1999-2004 Ford F-250 Super Duty; 1999-2004 Ford F-350 Super Duty; 1999 Ford F-250; 2007-2010 BMW 3 Series

Approximate Weight (g)

68

Lock Groove Quantity

3-groove

Lock Groove Style

Conventional

Overall Valve Length (in)

4.650 in.

Overall Valve Length (mm)

118.110mm

Quantity

Sold as a set of 8.

Swirl-Polished

Yes

Undercut Stem

No

Valve Head Diameter (in)

1.457 in.

Valve Head Diameter (mm)

37.000mm

Valve Head Style

9 degree dish

Valve Material

XH-426 stainless steel

Valve Seat Width (in)

0.080 in.

Valve Stem Diameter (in)

0.274 in.

Valve Stem Diameter (mm)

6.960mm

Valve Tip Length (in)

0.470 in.

Valve Tip Length (mm)

11.938mm

Thanks

Absolutely no issues

Came quick no issue

All was good with order

Product was great quality and fit perfect on my 2005 Ford f150.

Don't change a thing, its easy to navigate and the prices are great as well...

All good

Skip the ads and everything is good!

Best price I've found for my wiper blades.

Everything was easy to order

Quick and Easy, Amazon checkout

Very easy to order on this merchant site.

I looked all over the web for the Thule sidekick car top carrier and autoplicity had the best price and the website was easy to maneuver through. It willbe my first stop for shopping.

Am happy with price, lower than anywhere else. Product is perfect and shipping was fast. Had to call because website was down while price increases were uploaded, cost an extra $20 but still worth the savings. Would definitely buy from again.

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