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Manley 11688H-8 Severe Duty Pro Flo Hollow Stem LS7 Intake Valves 2.205in

(2008 Chevrolet Corvette 427 Limited Edition Z06; 2011 Chevrolet Corvette Z06 Carbon)

Manufacturer

Picture for manufacturer Manley

Part Number

11688H-8
9 reviews
Sale Price

$694.19

Estimated ship date Tuesday, November 17

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Live-in-stock inventory

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Product Details

Built to handle the extreme demands of high-performance and race applications, these valves feature a hollow stem design that reduces reciprocating valve train mass for improved high-RPM performance and reduced spring load requirements.

Key Features:

  • Valve Type: Intake
  • Head Diameter: 2.205 in.
  • Stem Diameter: 0.3133 in. (8mm)
  • Overall Length: 5.200 in. (Stock Height)
  • Tip Length: 0.300 in.
  • Underhead Profile: Pro Flo 12° x 3/8" radius for improved flow
  • Margin: 0.050 in.
  • Seat Width: 0.100 in.
  • Top of Head: 7° dish
  • Weight: 110 grams per valve
  • Material: NK-844 stainless steel with chrome stems and hardened valve tips
  • Hollow Stem Design: Reduces valve train mass for high-RPM stability

Manley's Severe Duty series valves are manufactured from premium NK-844 stainless steel with chrome-plated stems for exceptional wear resistance and durability under sustained high-stress conditions. The Pro Flo underhead geometry promotes superior airflow into the combustion chamber, making these valves an ideal upgrade for performance street builds, forced induction applications, and dedicated race engines.

Products specifications

Fits

2008 Chevrolet Corvette 427 Limited Edition Z06; 2011 Chevrolet Corvette Z06 Carbon

Approximate Weight (g)

110

Lock Groove Quantity

1-groove

Lock Groove Style

Conventional

Notes

Hollow stem valves.

Overall Valve Length (in)

5.200 in.

Overall Valve Length (mm)

132.080mm

Quantity

Sold as a set of 8.

Swirl-Polished

Yes

Undercut Stem

Yes

Valve Head Diameter (in)

2.205 in.

Valve Head Diameter (mm)

56.007mm

Valve Head Style

7 degree dish

Valve Material

NK-844 stainless steel

Valve Seat Width (in)

0.085 in.

Valve Stem Diameter (in)

0.313 in.

Valve Stem Diameter (mm)

7.950mm

Valve Tip Length (in)

0.300 in.

Valve Tip Length (mm)

7.620mm

great price ...fast shipping thanks

Very competitive prices and fast FREE shipping! Will do business with Autoplicity again!

1st time

Autoplicity has great prices and quality products for sale, I'd give it 1/2 star less for slow shipping given the option. Took a while to get out their door, regardless, I would still purchase again, thanks Autoplicity!

AWesome service. questions answered immediately via chat and order was en route via fed ex within 6 hours!!!!!!

Impressed with selection and price. Saved over traditional e-tailers and they shipped within 24 hours. Excited to recommend AUTOPLICITY.

This has been one of the fastest checkouts I've experienced in my years of parts purchasing as a DIY'er.

Great service and packaged really nicely!

Ordered an ARP ring compressor, best price I could find online, Fast shipping A++

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