Frame and Underbody: Other Pontiac Sunfire I

Length

Centerline length measurements are 3-dimensional measurements. The three dimensions are the following

1. Length, the distance between 2 points when the height is parallel to the center plane.
2. Height, the measurement is parallel to the datum plane
3. Width, the measurement is parallel to the center plane.

When reading dimension charts, horizontal width and length dimensions of the underbody are shown as viewed from the bottom of the underbody. Vertical dimensions are shown from the side of the underbody and use the datum plane as a base for all vertical (height) measurements.

Centerline measurements are used with universal measuring equipment.

Scheme 7

The vertical body zero line is a line drawn through the frame either at the forward or rearward torque box area of the frame.