Thanks GJ.

I found this information in another forum:

There are numbers stamped into the end of the torsion bar which will identify what diameter bar it is, but you to have the bar removed to see it. There's usually some paint splotch too...different diameters have different colours.

A-body Slant 6
.83" - yellow - 622/623(R/L early) 880/889(late)

A-body 2-bbl V8
.85" - Olive - 624/625(R/L early) 890/891 late)

A-body 4-bbl V8
.87" - Blue - 626/627(R/L early) 892/893(late)

My bars has the yellow color spots also...

torsion bars 2 (Medium).jpg
'77 Brazilian Dodge Charger R/T - Street Car
Footbrake, Pump Gas, SB Mopar 360" N/A
3300lbs, Leaf Spring + Assassin Bars
Best 1/8 mile ET
1.50 60' / 4.31 330' / 6.73@102.54mph