Cylinder Head Builder for Mazda MX-5 NA NB

Head Builder for Mazda MX-5 NA NB

Our comprehensive head builder for the Mazda MX-5 NA NB allows you to spec your perfect head. You’re able to see all possible camshaft combinations and what components you need to install them.

Camshafts can be selected from the dropdown for each engine. Here, you can choose from drop-in, short-duration cams all the way to massive high lift, high duration options that require a host of parts and machine work. Each camshaft has a description that outlines the parts and labour needed for installation.

Cams that require head machining have significantly larger lobes that come into contact with the casting of the head. We recommend sending both your head and cams to a machine shop and getting it professionally clearanced to ensure proper fitment.

For 1.6 cams that require retainers, you’ll need to upgrade to 1.8 retainers. All 1.8 cams should work with the standard 1.8 retainers.

If you have any questions about options or want to talk to us about your head building plans, give us a call on +44 (0) 203 795 0515  or send an email to [email protected].

Additional information


BOFI Racing


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) 1989 - 1998
Mazda MX-5 II (NB) 1998 - 2005

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