With Long Beach right around the corner, we wanted to look back to 1991 at IMSA's second race there. 🏁 Legendary Robby Gordon, in the #9 Roush Racing Mustang, battled it out with Pete Halsmer, in the #62 4 rotor RX-7. Interestingly, for short races like Long Beach, Roush used a Pinto based 2.5l Turbo 4 cylinder, but Roush was known to use a variety of engines ranging from that inline 4 all the way up to a 7.0l V8, all of which produced over 800hp 😳. Class regulations dictated that smaller engined cars could weigh less, so the lightweight but incredibly powerful 2.5l configuration was very fast but suffered from reliability issues on longer endurance races. Along with this, outright top speed could be more important than cornering and acceleration on tracks like Road America with large straights. Fascinating to think they would build an entirely different engine configuration just for one or two races🤔. #IMSA #200mphBeachParty #AGPLB #LongBeachGrandPrix #Motorsport #Autoracing #Ra...