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SKU: 11104-8 | UPC: 807298055855
Manley 1994-2005 Mazda Miata 1.8L (BP056) DOHC 16 Intake 34mm Stainless Race Master Valves
This Manley 11104-8 set includes 16 NK-842 intake valves sized 34mm for direct replacement in 1994-2005 Mazda Miata 1.8L BP056 DOHC cylinder heads on Base and LS models. NK-842 valves feature stainless steel construction with chrome stems for wear resistance and swirl polished faces to improve airflow and throttle response in high-rev applications. Expect consistent sealing and power delivery even in alcohol-fueled racing setups with 110.95mm overall length and 6.980mm stem diameter matching OEM specs.
Key Features
- Stainless Steel Construction: NK-842 one-piece forged stainless valves withstand extreme heat and pressure for dependable performance in track engines
- Chrome Stems and Hard Tips: Chrome-plated stems and hardened tips reduce friction and prolong life during aggressive valve train operation
- Swirl Polished and Fully Machined: Swirl polishing under the head plus machined margins and faces increase gas flow efficiency and combustion quality
- Race Master Straight Stem Design: 34.00mm head diameter 6.980mm stem and 110.95mm length ensure precise fit in BP056 heads for racing cylinder head setups
- Alcohol Engine Compatibility: Design handles methanol or alcohol fuels without compromising sealing or durability for reliable high-output operation
Product Notes
- Set of 16 intake valves matches OEM dimensions for direct drop-in replacement in BP056 DOHC heads
- Inspect valve seats guides and clearances before installation to maintain proper operation
- Ships in protective foam-lined box measuring 12in x 8in x 4in with 2.2 lbs net weight
Installation Notes
- Professional installation recommended.
- Remove cylinder head and use valve spring compressor tool for access and replacement
- Works with stock retainers locks and performance springs up to 1.200in maximum lift
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1994-1997 | Mazda | Miata | Base |
| 1999-2005 | Mazda | Miata | Base |
| 2000-2005 | Mazda | Miata | LS |
Why Choose Manley?
- Decades of racing valve expertise supports Mazda Miata engine builds around the world
- One-piece forged valves endure 10000 RPM operation without failure
- Exact tolerances provide drop-in fit and instant performance improvements
Frequently Asked Questions
-
Q: Will these valves fit my 1999 Miata NB 1.8L BP engine?
A: Yes the 34mm NK-842 valves match 1994-2005 Miata 1.8L BP056 DOHC heads in Base and LS models -
Q: What material and finish do these valves have?
A: One-piece stainless steel with chrome stems hard tips swirl polished undercuts and machined faces -
Q: What warranty covers these valves?
A: Manley offers a one-year unlimited mileage warranty against manufacturing defects when installed properly
Shipping &. Handling
- Method: UPS Ground
- Availability: In stock - ships same or next business day
- Packaging: Secure foam-lined box 12in x 8in x 4in
- Weight: 2.2 lbs
Manley Performance
Founded in 1966 by Hank Manley, Manley Performance Products has become one of the most respected names in high-performance engine components. Originally launched as Manley Speed Equipment, the company quickly earned a reputation for precision manufacturing, durability, and race-proven performance. From grassroots beginnings in New Jersey to global recognition in professional motorsports, Manley Performance continues to set the standard in high-performance automotive parts. Manley Performance Engine Parts Manley is known for manufacturing premium internal engine components designed for street, strip, and professional racing applications. Their product line includes: Manley stainless steel valves Manley forged pistons Manley connecting rods (H-Beam, I-Beam, Turbo Tuff, Pro Series) Manley camshafts Manley crankshafts Manley valvetrain components Valve springs, retainers, and hardware Every Manley component is engineered with strict quality control and race-driven innov...
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Browse all of our valves and valvetrain components at Black Ops Auto Works, including engine valves, valve covers, valve cover gaskets, valve guides, valve springs, retainers, valve locks, valve seals, lash caps, and related valvetrain hardware for performance builds, engine refreshes, and high-horsepower applications. Whether you are rebuilding a cylinder head, upgrading your valvetrain for higher RPM, or replacing worn valve train components, this collection is built for customers searching for engine valves, valve springs and retainers, valve cover gaskets, performance valve covers, and valvetrain upgrades. Shop Top Valvetrain Brands Find trusted brands in the valve and valvetrain category, including: GSC Power Division Supertech Brian Crower Ferrea Manley Performance Cometic Granatelli Moroso BLOX Racing These brands are known for performance intake valves, exhaust valves, valve spring kits, titanium retainers, valve guides, valve locks, valve seals, billet valve covers, an...
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