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Manley 11904-8 Severe Duty Stainless Steel Intake Valve Set for Chrysler 426 HEMI

(1989-1994 Nissan 240SX)

Manufacturer

Picture for manufacturer Manley

Part Number

11904-8
9 reviews
Sale Price

$301.07

2 left at this price

delivery box

Usually delivered within 2 days

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Live-in-stock inventory

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Fitment guaranteed

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Product Details

The Manley 11904-8 Severe Duty intake valve set is engineered specifically for Chrysler 426 HEMI engines, delivering exceptional performance for bracket racing, oval track, and high-performance street applications. This set includes 8 precision-manufactured stainless steel intake valves designed to withstand extreme operating conditions.

Key Specifications:

  • Valve head diameter: 2.250 inches
  • Valve stem diameter: 0.309 inches (0.3085 inches)
  • Overall length: 5.424 inches
  • Material: NK-844 stainless steel (intake specific)
  • Chrome stems with hardened valve tips
  • Set of 8 valves

Superior Material Performance:

  • NK-844 stainless steel offers over 4 times the ultimate tensile strength of competing intake materials at 1000?F
  • Exceptional resistance to chordal fractures caused by combustion chamber pressure
  • Swirl polished under head areas for optimized airflow
  • Fully machined combustion faces for improved efficiency

Severe Duty Series Features:

  • Designed for high-temperature gasoline engines
  • Proven fatigue life up to 100 million cycles in testing conditions
  • Chrome stems for enhanced durability and wear resistance
  • Hard tips for extended valve train longevity

Important Note: Bead Loc valve locks are required for proper installation. The Manley Severe Duty series represents the industry standard for performance and racing valves, trusted by engine builders worldwide for their superior material properties and exceptional durability under extreme racing conditions.

Products specifications

Fits

1989-1994 Nissan 240SX

Approximate Weight (g)

136

Lock Groove Quantity

1-groove

Lock Groove Style

Conventional

Overall Valve Length (in)

5.424 in.

Overall Valve Length (mm)

137.769mm

Quantity

Sold as a set of 8.

Swirl-Polished

Yes

Undercut Stem

No

Valve Head Diameter (in)

2.250 in.

Valve Head Diameter (mm)

57.150mm

Valve Head Style

20 degree dish

Valve Material

NK-844 stainless steel

Valve Seat Width (in)

0.095 in.

Valve Stem Diameter (in)

0.309 in.

Valve Stem Diameter (mm)

7.849mm

Valve Tip Length (in)

0.200 in.

Valve Tip Length (mm)

5.080mm

Very satisfied with this company. Ordered the part from another company and had nothing but problems. We found this place and the part was cheaper and they delivered the right part! Will do busy with again.

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

Really good prices and fast delivery.

thanks

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

Autoplicity has made my parts search so much easier. With the best price gurantee, i can now make autoplicity my one-stop shop for all my parts needs.

Lowest prices and fast shipping made this a great transaction.

I'm very pleased with Autoplicity. i needed a new battery for my antique Ford.After much searching,I found Autoplicity had it for over $25.00 less than the next lowest price I found. My order was shipped in less than 24 hrs. Thank you. I'll be recommending Autoplicity on the Ford forums I belong to

A+ part as advertised, quick shipping.

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