Romain Dumas led the way in the solo Glickenhaus 007 LMH with a 1m37.984s lap, which put him six tenths up on the solo Alpine A480-Gibson and eight tenths ahead of the fastest of the two Peugeot 9X8s in third.
Alpine driver Andre Negrao headed the times with a 1m38.602s midway through the session before Dumas leapfrogged that time and Paul di Resta’s 1m38.802s in the #93 Peugeot to propel the Glickenhaus to the head of the times.
The two Toyotas GR010 Hybrids took fourth and fifth positions in the Hypercar class.
Sebastien Buemi posted a 1m39.120s in the #8 car, a tenth up on the 1m39.287s to which Kamui Kobayashi improved right at the end of the session in #7.
The form of the Glickenhaus follows a Balance of Performance break for the American entrant ahead of the Monza 6 Hours: the car has been given another 18bhp over the previous power level of the car.
The second Peugeot ended up in 20th position behind the entire LMP2 field, Loic Duval setting a 1m41.522s on the 11th of only 12 laps completed by the car.
The quicker of the two Peugeots also encountered problems during the session: it stopped at the Ascari Chicane and was returned to its pit on the back of a truck on the completion of the session.
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#93 Peugeot Totalenergies Peugeot 9X8 of Paul Di Resta, Mikkel Jensen, Jean-Eric Vergne
Photo by: JEP / Motorsport Images
LMP2 was headed by AF Corse Oreca 07-Gibson courtesy of a 1m39.973s from Alessio Rovera.
That put him three tenths up on the Realteam by WRT Oreca in second place; Norman Nato’s 1m40.222s on the final lap was a small improvement on Ferdinand Habsburg’s previous best in the car.
Another later improvement came from Esteban Gutierrez in the Inter Europol Oreca, a 1m40.356s vaulting him up to third in class.
The Prema Oreca in which Robert Kubica set a 1m40.468s took fourth position, while the #22 United Autosports and Signatech-run Richard Mille Racing entries rounded out the top six in the hands of Filipe Albuquerque and Charles Milesi respectively.
Kevin Estre led the way in GTE Pro for Porsche, setting a 1m47.273s to end up three tenths clear at the top of the times aboard the fastest of the two Manthey-run 911 RSRs.
Antonio Fuoco took second in the best of the AF Corse Ferrari 488 GTE Evos on a 1m47.597s, which gave him a margin of almost exactly a tenth over Nick Tandy’s 1m47.702s in the solo Chevrolet Corvette C8.R.
Gianmaria Bruni and Alessandro Pier Guidi took fourth and fifth positions in GTE Pro for Porsche and Ferrari respectively.
Ben Barnicoat was quickest in GTE Am in the Project 1/Inception Porsche 911 RSR, his 1m48.389s giving him a four-tenth margin over fellow Briton Ben Barker in the GR Racing Porsche.
Practice for the Monza 6 Hours, round four of the 2022 WEC, continues at 9:00 local time on Friday.