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Here is an LSA supercharger with ZL1 lid. It is about 8 inches from the top edge of the cylinder head, and almost 9 inches from the front bolt mounting boss of the left cylinder head as shown.
They are REALLY tall. The Magnuson heartbeat is the shortest of the bunch. As it's not OEM it's big $$$. Still won't fit under my hood. :-( The FAST102 has to have the letters shaved off to fit under mine.