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Manley 11621-8 Stainless Steel Performance Valve 1.590" Head

(2007-2008 GMC Yukon XL 1500; 2007-2008 GMC Sierra; 2007-2008 GMC Yukon XL Denali; 2008 Hummer H2; 2007-2008 Cadillac Escalade + 2 more models)

Manufacturer

Picture for manufacturer Manley

Part Number

11621-8
12 reviews
Sale Price

$202.55

4 left at this price

delivery box

Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Manley 11621-8 is a precision-engineered stainless steel performance valve designed for high-performance and racing applications. Manufactured from Manley's exceptional Race Series alloy, this valve delivers superior flow characteristics and durability even under the most demanding conditions.

Specifications:

  • Head Diameter: 1.590 inches
  • Stem Diameter: 0.3136 inches
  • Overall Length: 4.923 inches
  • Tip Length: 0.160 inches
  • Underhead Angle/Radius: 25° x 7/16 inches
  • Margin: 0.070 inches
  • Seat Width: 0.115 inches
  • Top of Head: 18° Dish
  • Installed Height: Stock
  • Weight: 92 grams

Premium Construction Features:

  • Chrome-plated stems for enhanced durability and reduced friction
  • Swirl-polished underheads for optimized flow
  • Fully hardened tips for extended service life
  • Completely machined combustion faces for precise sealing
  • Controlled margin heights for consistent performance
  • Exact stem-to-seat concentricity for optimal sealing

Manley Performance has been the industry standard in high-performance valve manufacturing for over 40 years. These stainless steel valves are engineered to outflow and outperform competing products across all applications, from street performance builds to professional racing engines producing over 1,000 horsepower. The superior metallurgy and precision manufacturing ensure reliability in extreme temperature and high-boost environments.

Products specifications

Fits

2007-2008 GMC Yukon XL 1500; 2007-2008 GMC Sierra; 2007-2008 GMC Yukon XL Denali; 2008 Hummer H2; 2007-2008 Cadillac Escalade; 2007-2008 Cadillac Escalade ESV; 2007-2008 Cadillac Escalade EXT

Approximate Weight (g)

93

Lock Groove Quantity

1-groove

Lock Groove Style

Conventional

Overall Valve Length (in)

4.923 in.

Overall Valve Length (mm)

125.044mm

Quantity

Sold as a set of 8.

Swirl-Polished

Yes

Undercut Stem

No

Valve Head Diameter (in)

1.590 in.

Valve Head Diameter (mm)

40.386mm

Valve Head Style

18 degree dish

Valve Material

XH-426 stainless steel

Valve Seat Width (in)

0.115 in.

Valve Stem Diameter (in)

0.314 in.

Valve Stem Diameter (mm)

7.976mm

Valve Tip Length (in)

0.160 in.

Valve Tip Length (mm)

4.064mm

fast delivery good service

Found what I wanted with no problem.

Easy to order from. Shipping time pretty good.

very satisfied

Great price an faster then any parts stores thanks.... Should be on everyone call list if they need parts thanks guys...

ok

Very relaxed

So Far , So Good !!

Very easy to talk to on the phone and excellent service.

Great prices, and much faster delivery than expected. They "over-delivered" on what they said they'd do. Will definitely use them again!

shipped fast and great price

I was genuinely impressed with their price for my item and truly happy with the speed of their shipping. I'll definately look forward to buying from Autoplicity in the future!

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