[William]

<span style="font-style: italic">btw, the PHR test car, 9L507834, had a 3.55 axle. </span>

Well maybe. The article text states &quot;...the rear end gears were 3.73.&quot; Maybe they read it off the window sticker. Wouldn't be the first mis-stamped pop.

<span style="font-style: italic">I'm a doubter. The 68 4-core codes were the same and I've often seen 68 4-core service parts in cars. But I doubt they used 68 parts in mid-year 69.</span>

Never said they did. Motor Trend did a feature on ZL1 #68 N650643 about 10 years ago. Quoting the article: <span style="font-style: italic">&quot;The 427 in his Camaro ZL1 did not have the curved-neck radiator.”</span> Photos of the engine bay show a straight-neck radiator. Recently discovered COPO N651524, built the next day, has the same radiator.