My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Manley 11304-8 Pro Flo Intake Valve NK-842 Stainless 2.000" Head 4.900" OAL

Manufacturer

Picture for manufacturer Manley

Part Number

11304-8
6 reviews
Sale Price

$202.55

2 left at this price

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Manley 11304-8 Pro Flo Race Series Intake Valves are engineered for bracket racing, oval track competition, and high-performance street engine builds. Constructed from NK-842 stainless steel with a chrome-plated stem and hardened tip, these valves are built to withstand the demands of aggressive performance applications.

Each valve features a swirl-polished finish and is fully machined with an undercut stem to maximize airflow through the port. The Pro Flo underhead geometry—a 12-degree angle with a 3/8 in. radius—promotes smooth, efficient charge movement into the combustion chamber. The 7-degree dish top-of-head design further optimizes combustion characteristics.

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
  • Stem Finish: Chrome
  • Tip: Hardened

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

Products specifications

Approximate Weight (g)

108

Lock Groove Quantity

1-groove

Lock Groove Style

Conventional

Overall Valve Length (in)

5.010 in.

Overall Valve Length (mm)

127.3mm

Quantity

Sold as a set of 8.

Swirl Polished

Yes

Undercut Stem

No

Valve Head Diameter (in)

2.020 in.

Valve Head Diameter (mm)

51.3mm

Valve Head Style

5 degree dish

Valve Material

NK-842 stainless steel

Valve Seat Width (in)

0.080 in.

Valve Stem Diameter (in)

0.311 in

Valve Stem Diameter (mm)

7.9mm

Valve Tip Length (in)

0.290 in.

Valve Tip Length (mm)

7.37mm

No issues - a bit slow, but otherwise OK

Very happy with my purchase. SUPER fast shipping and great communication. Will use again!

Very fast shipping and product was secure in package to avoid damage....will be ordering from autoplicity again for sure. Also the price could not be beat.

great so far

Good product, great price, will do business again.

Very fast shipping & good prices.

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy