1 inch

Yes, iirc the early is just over 15” and the late is just over 16”. I’ll post pictures when I get to my shop in about 1/2hr.

Early 15-1/8” (top)
Late 16-1/8” (bottom)

No, you are confusing wheel offset for wheel width. The distance between the centers of the front wheels (if that’s what you mean by “stance”) is the same for all 944’s regardless late or early offset.

Yes, 4 degrees difference at the spindles. Early is 11 degrees and late is 15 degrees.

So, if the 924S has a track width of 55.8" (early offset) vs. the 944 with 58.2" (regardless of offset) gets late offset Control Arms/spindles/hubs installed there should be no change in front wheel track? Seems like it should increase by the 2" overall based on the difference in the control arms. In addition, the geometry will need to be adjusted to compensate for the 4 degree camber which can be accomplished using after market adjustable camber plates.

When you change control arms from early to late you change the offset of the wheels that will fit from 23.3mm to 52.3mm. However the center line of the wheel doesn’t change, therefore neither does the track or where the center contact patch of the tire sits on the road. The new wheel negative offset negates any positive offset applied by the control arm.

Even if you fit wider wheels you generally adjust the wheel offset to straddle evenly the extra width of the wheel either side of the previous wheel center line. There are off course exceptions where you adjust wheel offset on much wider wheels to clearance either the suspension or the fender, also if you go wide body, but commonly the track doesn’t change more than a negligible amount.

Whst exactly are you trying to achieve?

Ok, but for what reason do you want to convert it to later offset suspension? Are you planning to turn it into a track car?

Im not too familiar with the 924S, I presume it uses the early steel arms at the front and not the aluminum ones but it uses the aluminum arms from the 86 at the rear. Also it has early offset suspension but uses late offset wheels in order to fit inside the narrower fender. Is that correct?

Imo upgrading the brakes on a 924S shouldn’t be a priority for an occasional track car, stock brakes are plently good, personally I would spend the money on suspension and tires instead. However if you still want to fit 4-pot Brembos from the S2/turbo you don’t have to change your suspension to late offset, I think you just need rotors and calipers from an 86 turbo.

The only advantage of late offset would be the stronger hubs and easier rotor removal, but I’m not sure you would find Porsche wheels to fit easily and they would probably need to be a custom offset from an aftermarket supplier.

Again, I repeat I’m not too familiar with the 924S, probably should start your own new thread on the 924/944 forum where someone else can chirp in.