Brief History

ACE Performance Engines (Formerly Aircooled Engineering in the UK 2010-2019) was founded by Hot Rod & Aircooled VW enthusiast Stefan Rossi in 2010. Stefan specializes in GM LSx engines and Flat 4 Aircooled VW/Porsche engines.

Prior to opening the ACE doors for business back in 2010, Stefan had worked for some of the top VW restoration and engine shops in the UK & Canada, he also served in Afghanistan with the British Army. After 9 successful years based in the West Midlands, he felt it was time to expand the business across the pond.

The new shop is based in Torrance, California and will continue to specialize in new performance engine builds for Aircooled VW, Porsche and Chevrolet LSx based engines.

Some of our previous work…


Check out the ACE Facebook page and Instagram @aceperformanceengines for more pictures and videos of our work

The Builds

All engines are built by one engine builder in a clean, purpose built engine room. Each engine is fully balanced, blueprinted and built to highly detailed show standards. We also have an in house machine shop and ultra sonic tank for deep cleaning of engine parts. All builds are photographed and posted on social media to allow each customer to follow their build and see exactly what parts are going into their engine! Here is a selection of pictures from previous builds, you can find plenty more on our Instagram & Facebook pages!


Other projects…

We have also built a custom and complete Aircooled VW turbo kit. This will be available to purchase with an ACE engine or separately for your own engine. The kit consists of the best parts currently on the market… A choice of Holley or FuelTech EFI for engine and vehicle management (including traction control) A1 Muffler stainless turbo header, Garrett GT series ball bearing turbo, CB Performance throttle bodies and custom aluminum intake piping.

Chevrolet LSx turbo kit also coming soon… 

Keep an eye on the Facebook & Instagram pages for details!



ACE Billet Parts

ACE produces CNC billet parts for Aircooled VW, Aircooled Porsche and Chevrolet LSx V8 engines.



Current achievements of ACE built engines and vehicles

1966 VW Bus featured in VolksWorld Magazine with an ACE built 1915cc motor – 2015

1967 Yukon Yellow US Spec Vert VolksWorld Show ‘Outside choice’ award – 2015

 1968 Porsche 912 ‘Patina Irish Green’ – Hayburner Magazine cover car – 2016

1966 Chevy II Nova -Fastest Streetcar @ Hot Rod Drags, Shakespeare County Raceway 2016

1966 Chevy II Nova, 8 Second street car Featured in Hayburner Magazine – 2017

1950 Split Window Bug – ‘Best Of Show’ at the VolksWorld Magazine show with an ACE built engine – 2017

1966 VW bus – Camper & Comercial cover car and full feature with ACE built 2276cc Turbo EFI engine


We work by appointment only, enabling us to design engines specific to our customers requirements

Brand new Aircooled VW engines

Brand new Chevrolet LSx engines 

Turnkey engines, Long blocks, Short blocks

Turbo motors 

Race motors 

1000hp ‘daily driver’ motors

CNC machined billet and custom parts

Engine dyno coming soon!