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Manley 11787-8 Pro Flo Intake Valve NK-842 Stainless 2.000in Head

(2015-2021 McLaren 570S)

Manufacturer

Picture for manufacturer Manley

Part Number

11787-8
6 reviews
Sale Price

$188.69

2 left at this price

delivery box

Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Manley 11787-8 Pro Flo Race Series Intake Valve is engineered for bracket racing, oval track, and high-performance street engine applications. Manufactured from NK-842 stainless steel with a chrome-plated stem and hardened tip, these valves deliver exceptional durability and heat resistance under demanding operating conditions.

Each valve features an undercut stem for improved airflow and port velocity, a swirl-polished finish, and is fully machined to tight tolerances. The distinctive Pro Flo underhead geometry — 12 degrees x 3/8 in. radius — promotes smoother intake charge movement and enhances volumetric efficiency.

Valve Specifications:

  • Valve Type: Intake
  • Head Diameter: 2.000 in.
  • Stem Diameter: 0.3415 in. (11/32)
  • Overall Length: 4.900 in.
  • Tip Length: 0.250 in.
  • Installed Height: Stock
  • Underhead Angle/Radius: 12 degrees x 3/8 in. (Pro Flo)
  • Margin: 0.050 in.
  • Seat Width: 0.080 in.
  • Top of Head: 7-degree dish
  • Weight: 109 grams (3.84 oz.) per valve
  • Material: NK-842 Stainless Steel with chrome stem

Note: Measure existing valve head and stem diameter before ordering to confirm fitment.

Products specifications

Fits

2015-2021 McLaren 570S

Approximate Weight (g)

122

Overall Valve Length (in)

5.560 in.

Overall Valve Length (mm)

141.224mm

Quantity

Sold as a set of 8.

Swirl Polished

Yes

Undercut Stem

Yes

Valve Head Diameter (in)

1.900 in.

Valve Head Diameter (mm)

48.260mm

Valve Head Style

9 degree dish

Valve Material

XH-426 stainless steel

Valve Seat Width (in)

0.100 in.

Valve Stem Diameter (in)

0.371 in.

Valve Stem Diameter (mm)

9.423mm

Valve Tip Length (in)

0.350 in.

Valve Tip Length (mm)

8.890mm

Easy order process, quick shipping and great prices. Will shop here again for my truck parts and accessories.

Prices were good and the order shipped promptly. The email notice of shipment was a little late. It came after the order had arrived.

Great!

Product delivered as expected within 4 days. Lowest price on the web. No complaints.

This was an easy transaction, keep me notified thoughout the entire shipment. Price is what got my attention in the first place. I will be back for future needs.

Nobody else had part in stock. Instant shipping and a good price. Will do business again!

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