Manley Race Flo +1.0mm Stainless Steel Intake Valves Set of 8 for Mazda MX-5 NA NB 1.8

£260.00 inc. VAT

Available to order — usually ships in about 12 days

Manley pride themselves on manufacturing the best performance and racing valves in the world. They strive to produce valves of unparalleled quality that are perfectly suited to either the track or the street. Designed for engines that operate below 8,000rpm the Manley Race series of valves are at least equal quality to the best of other manufacturers on the market.

Manufactured from XH-842 steel alloy, Manley Race valves have a tensile strength of over 40,000psi at 815?C. Each valve’s stem is hard coated with 0.0002″ thick chrome to ensure the lowest friction possible within the guide. The tips are hardened to ensure they will not crack or erode even under extreme operating conditions. To finish the valves they are swirl polished and fully machined for increased durability. Manley’s Race Flo valves feature an undercut stem to offer significant flow gains without head porting.


  • Valve Head Diameter: 34.000mm
  • Valve Stem Diameter: 5.99mm
  • Overall Valve Length: 101.400mm
  • Undercut Stem: Yes
  • Valve Tip Length (mm): 3.505mm
  • Valve Material: XH-842 stainless steel
  • Valve Head Style: 17-degree dish
  • Valve Seat Width: 1.905mm

Additional information

Shipping Weight 0.432 kg
Shipping Dimensions 15 × 14 × 7 cm



Mk1 (89-98), Mk2 (98-05)

Warranty information

Warranties cover defects in materials and workmanship only. Warranty is for replacement of a similar product, repair of the original product or refund of the purchase value only and excludes all labour and incurred charges including towing, fitting, inconvenience, and purchases of other manufacturer's products. The warranty is good for the period stated in the additional info tab from the date of purchase. Mileage warranties are for road use only and proof of mileage is required. Products must be installed by an independent experienced professional mechanic and the suspected defect must be present at the outset. The warranty does not cover damage caused by incorrect installation, failure to comply with the maintenance requirements of the vehicle, processing or otherwise changing the product, ordinary wear and tear, or any other external influences. Warranties are invalid if the product is used for racing, rallying, drifting, track days or any other form of motorsport or competition. Please refer to the manufacturer's own warranty documentation for more information.

Making a warranty claim

Proof of purchase receipt showing the date of purchase, proof of mileage at installation, proof of current mileage and invoice of the work undertaken by an independent experienced professional mechanic must be supplied along with the returned products for a warranty claim to be considered. If your vehicle needs to be used whilst your warranty claim is considered replacement parts from the same manufacturer should be purchased through BOFI Racing. In the event of a successful warranty claim, we will refund the card that was originally used to purchase the replacement parts, in full or in part depending on the nature of the claim. BOFI Racing reserves the right to make full or partial compensation at its sole discretion depending on the condition and mileage use of the returned suspect parts. For example, if you have used the part for several thousand miles before a defect is noticed, only partial compensation may be offered.

Make Model Year
Mazda MX-5 I (NA) 1993 - 1998
Mazda MX-5 II (NB) 1998 - 2005

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