We have always suspected that LA and Norwood stripes were done differently. The more we know the less we understand.
And unfortunately it still isn't much.
Chevy produced 20,302 Z/28s at two plants; about 81% at Norwood 19% at Van Nuys. To have a reliable statistical basis you would need to examine an evenly distributed 5% of each population. That's 820 cars from Norwood and 200 cars from Van Nuys.
Every process has inputs that vary; thus the output also varies. The masking decals and tape used for the stripes may have come from a single source; there may have been a different source for each plant. They may have been re-sourced during the model year or an alternate source used during peak production periods. If they were supplied at a fixed rate and remained in stock longer during low Z/28 production they may have shrunk slightly. The tooling that produced the decals became worn over time and may have been replaced. The set up parameters for the decals varied. Both plants operated two shifts and rotated operators; dozens of people could have applied the decals and tape over the model year. Lots of opportunity for variance here.
Norwood had about 286 days of production; Van Nuys 200. When 5% of each days striping at both plants has been measured you will have lots of data. You may find variance by plant, week, season, operator, supplier of decals and on and on.
You can't draw any conclusions from sampling .01% of a population.
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I have an early LA Z/28 (09A) D 80 car with factory paint and the rear stripes go all the way to the edge of the deck lid.Everybody says that the stripes should stop under the spoiler but this car is proof that things vairy from the norm.