Does a drum to disc conversion increase or decrease wheel offset?

[6'9"Witha69]

To answer
#1: Yes, in the rear the thickness of the hat v. the drum will be the deciding factor.
#2: The spindles are the same other than the upper bracket boss. The Disc version is thicker than the drum. THis only affects caliper bracket mounting, not rotor.
#3: All the different kits use different types of hubs. This is where there can be no concensus. Some may increase tw while others decrease and some keep it relatively the same. As you say, < +-0.125" won't make much difference at all unless you are shoving 9.5"+ wide 17-18" rims up front and wanting it to work the best.

[Josh69]

To answer
#1: Yes, in the rear the thickness of the hat v. the drum will be the deciding factor.
#2: The spindles are the same other than the upper bracket boss. The Disc version is thicker than the drum. THis only affects caliper bracket mounting, not rotor.
#3: All the different kits use different types of hubs. This is where there can be no concensus. Some may increase tw while others decrease and some keep it relatively the same. As you say, < +-0.125" won't make much difference at all unless you are shoving 9.5"+ wide 17-18" rims up front and wanting it to work the best.

Thank you, that is the type of info I was looking for. I knew about the upper boss being different, but wasn't sure if the bearing mounting flange was inboard/outboard relative to a drum spindle. I'm primarily looking at kits that re-use the drum hub (most C4/C5 conversion kits). If I understand correctly, if I re-use my drum hub and spindle, the only difference will be in the thickness of the hat vs drum on the front as well?

Sorry if my original question wasn't clear to all, I'll try to phrase them more specifically....I guess I figured the general info was applicable to most situations.

Beefy, I'm not trying to be confrontational, but your questioning my abilities didn't exactly come off as being very helpful. The car is listed in my sig....I assumed that people would make that deduction, it's a 1969 Pontiac Firebird.