1968 Road Runner '383' vs. 1968 Chevelle 'SS 396'

Magnum Dart

On the 1968 Chevelle SS396 'L-35'

If you measure horizontally, the 'Amber' does start at 5200 RPM's like you stated.

And the Red-Line, looks to be just a 'tad' under 5500 RPM's.

http://chevellestuff.net/1968/images/68_5500_tach.jpg