Meanwhile, French supercar manufacturer Venturi had been developing their own versions of the PRV. The most powerful versions they built were in the Atlantique 300 at from a single turbocharged 3.0 L 12v, and they successfully raced at the 24 Hours of Le Mans with the 600LM with a twin turbocharged 24v 3.0-litre, pushing out over in race spec, and the road-going spin-off, the 400GT managed . This used the low compression bottom end common to the Renault turbo engines, coupled to 24-valve cylinder heads with bespoke rockers and tappets.