Diff between C4 & C4HD caliper carriers?
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From: Ohio
Car: 1970 Nova
Engine: 850HP 383
Transmission: TH400 w/ Brake
Axle/Gears: 4.88 12 Bolt
Diff between C4 & C4HD caliper carriers?
Searched and looked at all posts w/ C4 stuff in it and cant find out what the diff in the 2 is.I know if Ed chimes in he'll be able to tell me,Hes the Brake GOD!!!!! Thanks for the help on the back setup Ed.But I also need to know if there is a way to tell the diff by measurement cause I have a set of carriers now,but Im not sure which ones I have if there is a diff.Any help would be greatly appreciated.
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From: Another world, some other time
Car: 86 LG4 & 92 TBI Firebird
Engine: The Mighty 305!
Transmission: 700R4
Axle/Gears: 3.42
The HD carriers are wider and taller to fit around the larger HD rotor. The HD rotors are 1.1" x 13", the standard are" .81 x 12"
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From: Fort Mill, SC, USA
Car: '88 Iroc, '91 RS, and a '70 RS
Engine: 5.7 TPI; 5.0 TBI; ZZ4/T56 on the ag
Transmission: A4, A4, slated to be a T56
As James said, the HD carriers are wider to hold a thicker rotor, they're about 1.25" wide to hold the 1.1" rotor.
Ed
Ed
N/M stupid me forgot I had directional rotors w/ this setup,so these r the HD's. 
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