Authentic Design, Race-Proven Engineering

You want to compare kits? Start with the frame. The artistry, strength, and complexity of the Factory Five Mk4 frame is reason enough to stop looking right here. The beauty of our design is accentuated by the fact that it is stronger and more rigid than you’ll realistically need.

We use an authentic 4” round tube design. We feel strongly that a quality replica should have a period correct, 4” round tube frame, just like the original legend. The tubular ladder-style frames used in the original 1960s AC cars are more than beautiful, they are representative of a period of automotive design that is legendary. We chose to use this style of frame despite the manufacturing difficulty and cost, since a huge part of a quality replica is its faithfulness to the spirit of the original cars.  While originality is very important, if the frame doesn’t perform, what good is it? We kept the design style, but used CAD technology, better materials, and more consistent manufacturing methods to make it more than twice as strong.  

Since 1995, the Factory Five Roadster frame has become known for its strength and ability to protect its occupants. With over 800 welds and hundreds of individual pieces of steel, the Mk4 frame is both engineering excellence and functional automotive art. The frame is a completely welded assembly and requires no welding or cutting.

When you see Factory Five cars winning national races or lifting the tires clear off the ground, check out the “straight-as-an-arrow” frame quietly doing its job.  There is no finer replica frame. Period.