Wilwood conversion problem
It's been years since I was involved with those hubs, but I rather doubt it. I converted all of the hub p/n's in their inventory from castings to forgings. Some clearly could be made smaller on the register, but there was no point because that would have made them non-stock.
As to hub-centric vs. lug-centric; I don't see any real advantage in hub-centric. Maybe, MAYBE, if I were regularly going 200 MPH there might be a difference. At the sub 100 mph velocities that I'm bound to it's not important.
Wilwood's position at the time was that there are too many different wheels out there, stock and aftermarket, to try to make the hubs fit them all. They strived to make the hubs as close to the OE shape as was possible. I doubt that's changed. As posted in this thread there are stock wheels that don't fit stock hubs. I don't see how wilwood could correct that. As to their telling you this fits and that doesn't fit, they did in a way. They publish a drawing with the important dims. They don't know the dims of your wheels - it's simply not possible to keep track of all of the relevant dims of all of the wheels that could ever likely be used on any of their products. They give you the dims that you need to be able to decide if your wheels will fit. The idea that performance improving parts should bolt-on like they're OEM and work with everything else that isn't OEM that happens to be on the car is a bit preposterous. All of the aftermarket part mfg's strive for it as best they can, but they know it's never going to happen 100% of the time. They're lucky to get 10%
The problem is they
DON'T give the relevant dimensions, and they say that their kit will fit a 14" rim. Sure, some of them maybe, but since the kit is made for a drum brake car you would think they could bother to say the stock drum wheels won't fit over the register. It's not a kit for KH disk car, or a 73+ disk car, it's a kit for a car with a 10" drum spindle, and the 14" stock drum wheels won't fit. Nowhere on the dimension drawing is the diameter of the hub register. Bearing diameters, measurements for the caliper clearance, oil seals, blah blah blah, all on there. They even give the
height of the hub register, but not it's diameter.
Here's the dimension drawing for that kit
http://www.wilwood.com/Images/BrakeKits/WCD_Drawings/WCD_dwg-Large/ds759_wcd-lg.jpg
And here's the spec page for that hub...
http://www.wilwood.com/Hubs/HubProd.aspx?itemno=270-11539
But, unless I totally missed it (which I admit is possible) the actual diameter of the hub isn't on there. I've managed to find it on some of the kits Wilwood offers, like this one
http://www.wilwood.com/Images/BrakeKits/WCD_Drawings/WCD_dwg-Large/ds659_wcd-lg.jpg, but not all of them. And not this one in particular. I've looked at more than a few kits, and since I run aftermarket rims I always try and find that information. Especially since a lot of aftermarket rims need to be modified to clear the gigantic hubs that the stock 73+ mopar rotors have.
As far as hubcentric goes, it would be nice, but that's not going to happen on an aftermarket brake kit. Or aftermarket rims for that matter. Best you can usually do if you're worried about it is a set of hubcentric spacers. But it's kind of moot if the wheel doesn't even fit over the hub.
All reasons why I have a Dr. Diff 13" rotor kit. Because I can call Cass and not only will he tell me the exact dimensions of the hubs that his rotors use, he can even tell me how much I can turn them down if I need to in order to clear a set of rims. I'm pretty sure the Wilwood answer to that question is "that would void your warranty".
