There are a couple of factors that affect brake performance that the willwood kits are short on.
1. the brake rotors are smaller OD than stock. I think they are smaller than stock. I don't know the thickness but think I heard an inch thick.
2. The rotors are lighter than stock, less mass means the rotors heat up quicker.
3. The calipers are somewhat small. While the piston size in them is the same size as used in a 67 or 68, the caliper itself is pretty small and MAY lack rigidity. It will be operating at around 800 psi on a normal Camaro to lock a wheel. the higher the pressure, the higher the flex.
If you had air conditioning or a big block the caliper pressure could easily go to 1100 psi.
Usually 1200psi is the limit these calipers can stand.
When you look at what the NASCAR guys are using in the willwood line, it is a much heavier caliper with similar piston sizes.
I met a guy last year running a 69 Camaro on the road course at Laguna Seca for the first time. He had the willwood heavy duty kit, and was bragging about the weight he saved.
I came back this year and he has a Baer brake setup on it. The Willwood kit was not "enough".
He has also added big brake ducts.
Some people have posted in defense of the Willwood kits. I can only guess that they drive fairly stock cars on the street where the brakes are not highly heated. Or have the heavy duty version Willwood kit.
A lot depends on the use and weight of the car. But the willwood brakes are not overkill or equal to the Baer kits.
Willwood is certainly capable of producing better kits right off their parts shelves.
They have bigger rotors, and stiffer calipers, and seem to be moving in the Pro-Touring direction.
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327
69 Camaro Vintage Racer
65 Lola T-70 Chev 350 Can-Am Vintage Racer
[This message has been edited by davidpozzi (edited 11-29-2001).]