Precision engineering for all your performance and race needs


Our average customer
rating is 4.4 / 5

What Our Customers Say​

    Very helpful and if you need any advice jon has all the answers good customer service good products and cheap cost and quick delivery

    Tom Sharpe Avatar Tom Sharpe

    Big thanks to spec j motorsport l, built me a z20 short block and the craftsmanship that has gone into it is out of this... read more

    Robert Proctor Avatar Robert Proctor

    Great service from start to finish and clearly takes pride in what he does. Highly recommended �

    Matt Loane Avatar Matt Loane
The machine shop at SpecJ is the core of our business. We pride ourselves on our state-of-the-art facilities and modern techniques.


01388 434348

[email protected]
Unit 6E Castle Close Industrial Estate, Crook, DL15 8LU

About us

SpecJ Motorsport is a performance engine preparation facility, catering for everything from fast road to race engine building, machining, parts and more.
With 15 years of engine building/machining experience whilst working in other performance shops, a lack of performance orientated machine shops in the northeast was discovered. SpecJ was founded in 2021 by Jonny, with a vision to bring a one-stop-shop for all aspects of engine machining and building for the public and other shops alike. In this short space of time we have gained a reputation for working to close tolerances and producing products for the end user to the highest standards.