I run my clutch fan about 3/4" of blade width into the shroud (measured at the top) with a spacer. The front of the clutch is about 3/4" from the core.
I switched from a factory flex fan and had to get a shorter spacer to maintain the factory fan location* (1st 3/4" of blades in the shroud, measured in in advance of buying the clutch and spacer that would locate the fan correctly.
The factory flex, IIRC, was a 4 blade unit, clutched fan is a 5 blade unit. I don't know what the listing was for or the brand on the clutch. I just opened a bunch of thermals on the counter at the parts house and found one with dimensions that would work for me with a spacer they had in stock. Spacer and clutch were both off the shelf from O'Reilly's.
*Assumed factory location at any rate. My car spent it's life in AZ up until 87 or so and has a massively thick cored radiator with 3 deep 3/8" tubes installed at some point. The flex fan and spacer had Chrysler markings on them, though the radiator tanks do not.
Last edited by BcudaChris; 08/16/18 03:28 PM. Reason: typos