-20%
Sold out
Click to zoom in
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
Manley Performance is a New Jersey-founded engine internals manufacturer stocked at Black Ops Auto Works, supplying forged pistons, connecting rods, valves, and crankshafts across domestic and import platforms. Shop Manley H-Beam and H-Tuff connecting rods, Race Master Series valves, forged crankshafts, and valve springs for Ford Modular and Coyote, Chrysler HEMI, Subaru EJ and FA, Nissan SR20 and 2JZ, Honda B and H-series, and Mitsubishi 4B11T and Mazda MZR platforms. Every product is filterable by year, make, model, and engine code so the correct part ships the first time. Black Ops Auto Works carries 270 Manley Performance SKUs across pistons, rotating assembly, and valvetrain components. About Manley Performance Founded in 1966 by Hank Manley as Manley Speed Equipment, Manley Performance has grown into one of the most established names in high-performance engine internals. From grassroots drag racing roots in New Jersey to a second manufacturing facility in Orange, Californi...
View Manley Performance Products
Valves
Engine valves for import, domestic, and European performance builds are stocked at Black Ops Auto Works. Shop intake valves, exhaust valves, single-groove and triple-groove valves, Inconel and titanium valves, and complete valve sets for 2JZ, RB26, RB25, VR38DETT, K-series, EA888, EA113, FA20, S58, B58, and HEMI 5.4L and 5.7L applications. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 577 valve SKUs across intake, exhaust, and material specification categories. What This Category Covers The Valves category covers replacement and upgraded intake and exhaust valves for naturally aspirated, turbocharged, and supercharged cylinder heads. Coverage spans budget-focused OE-spec valves through race-grade Inconel and titanium valves built for sustained high RPM and boosted horsepower. Categories Included Intake valves, exhaust valves, single valves sold individually, and full valve set...
View Valves Products
Valves & Components
Valves and valvetrain components for import, domestic, and performance engine platforms are stocked at Black Ops Auto Works. Shop intake valves, exhaust valves, valve covers, valve cover gaskets, valve guides, valve springs, retainers, valve locks, valve seals, and lash caps for Toyota 2JZ and Supra, Honda K-Series, Nissan RB and SR20, BMW B58 and S58, Subaru FA20, Ford Coyote, and GM LS platforms. Every part is filterable by year, make, model, and engine so builders and tuners can confirm fitment before ordering. Black Ops Auto Works carries 1,391 valvetrain SKUs from proven performance brands. What This Category Covers Valves and valvetrain components manage airflow into and out of the combustion chamber and keep the valvetrain sealed and stable at high RPM. This collection spans intake valves, exhaust valves, valve covers, valve cover gaskets, valve guides, valve springs, retainers, valve locks, valve seals, lash caps, and cam follower shims. Why the Valvetrain Matters for Pe...
View Valves & Components Products