i've got one on a 10.5 comp 440 aluminum headed .550ish solid flat tappet 850 demon 1.5 rockers 727 w 3500 conv 4.30 29.5x10.5 m/ts 3400lbs race weight shift it at 6400 runs 11 teens @120.no work in ternally but i cut off all mounting stuff cast on the outside.