In service under 20 hours. Bought this carb for my Indy EZ295 setup, but now I am building a sequential EFI twin turbo new generation Hemi and so I am selling my old stuff. Brand new condition, sweet response, 1050 CFM on a 4150 base. Summit wants $823.20, I want just $720. I am in Santa Clara, CA, the carb is in Sacramento. My email address is bjasonsmith at juno dot com.