This is an APD 1050 CFM Max Speed Alcohol Carb (Part Num 9913). This carb is tuned and has run on both a 496 CI and 582 CI Big Block Chevy. The carb was built in 2014 and is in great shape. Only selling because I’m going back to Gas on my new motor. Give me a call if you have any questions 480-216-5037.