Sage Karam turned in the fastest lap in a three-hour practice session which featured Robert Wickens' first crash on an oval.
With the aid of the day's only 230 mph lap, Ed Carpenter overcame the whole of Team Penske to earn his third Indy 500 pole.
Though Ryan Hunter-Reay was fastest overall thanks to a draft, Simon Pagenaud turned in the fastest lap without a tow during the seventh Indy 500 practice.
James Davison's entrance into the field of 33 for the 2018 Indy 500 was different than his past experiences at Indianapolis, though almost equally complicated.
James Hinchcliffe and Pippa Mann were 34th and 35th fastest on Bump Day and failed to qualify into the field of 33.
The initial qualifying order that will go into effect when Bump Day begins was decided following Fast Friday practice.
For the second time of the week, Marco Andretti landed his No. 27 Honda atop the speed chart in Indianapolis.
Graham Rahal's top speed remained untouchable throughout the Practice 4's seven-hour duration at IMS.
After debuting the technology when Will Power crashed at St. Petersburg in 2016, INDYCAR has fully implemented the I-Portable Assessment Test for diagnosing concussions.
Strengthened by Sage Karam's ability to drive through the field and J.R. Hildebrand's intelligence, Dreyer & Reinbold Racing is looking to turn its one-off status at the Indy 500 into a more permanent presence.