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Manley 11553-8 Severe Duty Exhaust Valve 1.720" Big Block Chevy

(2010-2014 Ford Mustang)

Manufacturer

Picture for manufacturer Manley

Part Number

11553-8
5 reviews
Sale Price

$301.07

Estimated ship date Saturday, November 28

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Product Details

The Manley 11553-8 Severe Duty exhaust valve is engineered for high-performance and racing applications in Big Block Chevrolet engines. This valve represents Manley's signature series in the performance and racing industry, delivering exceptional durability under extreme conditions.

Key Features:

  • 1.720-inch valve head diameter for optimal flow
  • XH-428 stainless steel construction for superior heat resistance
  • Chrome stem with hard tip for extended wear life
  • Swirl polished and fully machined for precision fit
  • Severe Duty series design for racing and high-performance applications
  • Set of 8 valves included

The XH-428 stainless material provides excellent hot hardness and high-temperature strength, making these valves ideal for forced induction, nitrous, and naturally aspirated builds. The chrome stem finish reduces friction and wear, while the hard tip design ensures longevity even under aggressive valve spring pressures. Each valve is swirl polished and fully machined to exacting tolerances for consistent performance across the entire set.

Manley Performance has been manufacturing premium engine components since 1966, and their Severe Duty valve series continues to set the standard for professional engine builders and racers worldwide.

Products specifications

Fits

2010-2014 Ford Mustang

Approximate Weight (g)

122

Lock Groove Quantity

1-groove

Lock Groove Style

Conventional

Notes

Underhead angle/radius 10 x .375 in. Margin 0.065 in.

Overall Valve Length (in)

5.354 in.

Overall Valve Length (mm)

135.992mm

Quantity

Sold as a set of 8.

Swirl-Polished

Yes

Undercut Stem

No

Valve Head Diameter (in)

1.720 in.

Valve Head Diameter (mm)

43.688mm

Valve Head Style

6 degree dish

Valve Material

XH-428 stainless steel

Valve Seat Width (in)

0.100 in.

Valve Stem Diameter (in)

0.372 in.

Valve Stem Diameter (mm)

9.436mm

Valve Tip Length (in)

0.220 in.

Valve Tip Length (mm)

5.588mm

Make

Chevrolet

Valve Head Diameter

1.720

Stem Diameter

0.3715

Engine Type

ICE

Engine

Big Block

Product Type

Engine Exhaust Valve Kit

Seat Width

0.100

Tip Length

0.220

Top of Head

6 Degree Dish

Valve Stem Diameter

0.3715

Valve Type

Exhaust

Valve Series

Severe Duty? Series

Engine Valve Quantity

8

Margin Width

0.065

Underhead Angle

10.00

Underhead Radius

3/8

Valve Head Shape

6 Degree Dish

Valve Quantity

8

Valve Tip Length

0.220

O/A Length

5.354

Valve Length

5.354

Head Diameter

1.720

Title

Manley Valve - Exhaust, Valve-S/D 1.720

Easiest place to order from I have yet seen!

Always easy to work with has what i need

cheapest price out there cheap ship

I'll start off saying that Autoplicity's prices are unbeatable...but, I placed my order on a Saturday night (which I know is the weekend)on a in stock part and it took them till the following Thursday to ship it out. I use my truck to make a living and was hoping to get it a little quicker, but now I'm down another 3-4 days till the part gets here. Also, I sent a e-mail on Tuesday evening regaurding my order and never got a response.

Autoplicity, was very easy to use, very fast, and an enjoyable experience. I would recommend to my closest friends!!

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