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Black Widow 250 V8 Spider Plate System

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Quick Overview

The Wizards of NOS Black Widow 250 Spider Nitrous Plate System is a complete wet plate system intended for V8 engines running 4 barrel Holley carbs, that is capable of flowing an incredible 250 BHP.

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Black Widow 4150 Spider Nitrous Plate

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  • Black Widow 4150 Spider Nitrous Plate


The Wizards of NOS Black Widow 250 V8 Spider Nitrous Plate System is a complete wet plate system intended for V8 engines running 4 barrel Holley carbs and is capable of flowing 250 BHP.

The Wizards of NOS Black Widow 250 V8 Spider Nitrous Plate System (BWS) utilises the most advanced plate design in the world and is available to suit most V8 engines.

Its unique design sets it head and shoulders above all other plates, as only the WON BWS nitrous kit offers all the benefits of a direct port nitrous system plus all the benefits of a plate (without the disadvantages of either), all in one compact package.

The BWS plate system benefits from numerous unique features as standard equipment, which offer substantial advantages over all other options.

Click here for a comparison of WON vs other brands.

Click here to see the results of an independant test done on a WON kit vs a Nytrex kit.

All WON BWS systems benefit from;

  • Lifetime guarantee.
  • The ultimate in high quality components, which are machined to aerospace standards
  • The famous WON Direct Port Black Widow Spider nitrous plate.
  • The famous WON billet alloy X-10 Nitrous Pulsoids.
  • EU specification nitrous bottle
  • The WON billet alloy FlowMax nitrous valve, with our unique SPRV.
  • The Laserlite QD nitrous bottle mounting system.

If you want a simple to fit, reasonably priced system that delivers maximum reliability and power; the WON BWS nitrous systems have been designed and developed with you in mind. These systems are available for street and race use, so you can enjoy the WON experience purely for the thrill or for the more serious use, of gaining a competitive edge.

Black Widow Spider nitrous systems are offered in a range of power levels, with the Black Widow Spider 250 V8 Nitrous Plate Kit being the lowest power rated system, capable of delivering additional power of up to 250 bhp.

With all WON components being manufactured to such extremely high standards, the Black Widow range offers peace of mind as well impressive results and all at a competitive price.

Parts include;

  • 1 x 4150 or 4500 Spider Plate (as required)
  • 2 x 2" length 4mm SS supply lines from Pulsoids to Spider
  • 15 x 4mm retaining nuts and olives 
  • 2 x 4mm billet Y-pieces
  • 1 x Pair of 250 HP X-10 Pulsoids (nitrous & fuel).
  • 2 x Pairs of Pulsoid to Spider mounting brackets
  • 1 x 1m length 5mm nylon fuel supply pipe
  • 1 x 1m length 4mm nylon nitrous supply pipe
  • 1 x 5m length braided hose nitrous supply pipe.
  • 3 x 5mm nuts and olives
  • 1 x 1m length 8mm rubber fuel pipe
  • 2 x Retaining clips for rubber fuel pipe 
  • 1 x 11lb bottle with Maxflow Valve
  • 1 x QR polished SS Bottle Bracket
  • 1 x Fuel adaptor
  • 1 x Throttle activated micro switch & bracket 
  • 1 x Arming switch w/ aircraft style cover 
  • 1 x pack of electrical connectors and wire pack
  • 2 x pairs of metering jets

Whether you just want the famous WON experience or you need the ultimate power to win races, the Black Widow will deliver exactly what you want - order online NOW!


Plate Thickness: 1''

Centre Bore Orifice: 4 x 53mm

*Bottles shipped empty

Although the image used may not be a true representation of the parts included, the parts list is 100% reliable. 

Installation Manual


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Yours Sincerely, The Wizards of NOS Team