Are 10 x 2 1/2 rear drums big enough?

[1MeanA]

I got this project car which came with newly rebuilt 10 x 2 1/2 rear drum brakes. I want to transfer these over to a Dana 60 I will be narrowing. Will they be big enough for a 11.5 second car? I'll have manual front discs and a proportioning valve. I hate to spend more money finding and rebuilding 11x3's but if I really should then I will. Thanks.

 

[TheGreenSlime]

Even the 11x3 cars had the 11x2.5 rears. The rears do about 30% of the stopping power and stopping from about 120 MPH with front discs and even 10" drums should be no problem. Rear discs are best left for road racing where you have repeated hard stops (the only advantage discs have over drums is they run cooler) but the drums are a better brake because of the servo action. I have 11x3's on my 66 Bel II and the original 10" in the rear and it's fine even on hard stops. Another thing, I have a 68 RR that came originally with the optional Bendix 4 piston disc brakes and it came with the 10" drums in the rear.

 

[stroked 340]

10 1/2 is what i run on my 8 3/4,in my '70 duster running 11.0's stops it just fine,running front drum brakes too...

 

[1MeanA]

Thanks guys. I just saved a bunch of money! :-D