V8 Engine Specialists & All Mechanical Repairs

We Service All Makes & Models. Qualified Vehicle Certifiers for Cars & Motorcycles.

Hydroplane Boats

Rivers Speed & Spares have had a long relationship with the Annihilator Race Team starting back in 1993.

Drag Racing

A One Stop Shop for all your needs from engine building, tuning, fabrication and chassis work.

Circuit Racing

We work on all types of vehicles and can design and fabricate to meet your requirements.  Let us help you build that vehicle you really want.

Hot Rods

We pride ourselves on turning out top quality workmanship on every job, from engine rebuilds, turn key rebuilds, modifications and also able to complete LVVTA certification on modified vehicles.



Grant is an authorised vehicle certifier with the LVVTA. Once a vehicle is modified from its original state or is a scratch built, it requires certification to ensure that it is safe to operate on the road, and comply with the legal safety requirements.

ACC & Enable

We are contract holders for Levels 1 and 2 vehicle modifications. Our goal is to provide vehicle modifications for clients who have been identified by ACC as requiring vehicle modifications to meet their injury related needs.

Latest Blog Posts

Drag Racing Nationals

Drag Racing Nationals

Was great to start the 2023 season the way we finished 2022 with a win at the 55th NZ Drag Racing Nationals in Competition Division, super close finished.0019 of a second then to cap it off,we reset the National Record,both ends, 6.821@ 202.50mph, thanks to the loyal...

Central Nationals

Central Nationals

Well, what a fantastic way to end 2022. We ran the dragster at the Central Nationals at Masterton on the 10-11 December 2022 in the Comp Division. It was a showery day Saturday with on two passes and another three on a nice hot Sunday. They were awesome passes, all 6s...

Hydro Thunder

Hydro Thunder

Was a great weekend at Mangakino for the 2nd round of Hydro Thunder on the 3rd and 4th December for our Engines, Ken 1st and David 3rd, a great drive from Steve Preece in his HRE powered machine for a strong 2nd, was a shame David and Jack came together in the final...

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