Ferrari has entrusted its latest-spec power unit to customer teams Alfa Romeo and Haas, while the Scuderia will likely run the new engine at Monza.
Both Kevin Magnussen and Romain Grosjean are running the new unit at Spa while only Antonio Giovinazzi will have the updated hardware at Alfa Romeo.
All three drivers remain clear of any grid penalties at Spa following the change, and so will Sebastian Vettel and Charles Leclerc at Monza next week.
But Kimi Raikkonen's switch at the Italian Grand Prix will lead to a grid demotion as the Finn has already reached the limit of each PU element.
Ferrari's decision to supply its latest engine to its customers teams means that all manufacturers are running updated units at Spa.
Renault's Nico Hulkenberg and Daniel Ricciardo, as well as McLaren's Carlos Sainz, are all set for a five-spot grid drop following their adoption of the French manufacturer's Spec-C engine.
Honda-powered drivers with updated engines Alex Albon and Dany Kvyat, as well as Mercedes-powered Lance Stroll will line up at the back of the grid following multiple engine changes.
Gallery: The beautiful wives and girlfriends of F1 drivers
Keep up to date with all the F1 news via Facebook and Twitter
Had Niki Lauda been given the good fortune to read the next day's newspaper on…
Few places in Formula 1 carry as much emotional weight for Ferrari as Monza, and…
Red Bull has been forced to confront an uncomfortable reality after the Dutch Grand Prix,…
Next month, Max Verstappen will trade Formula 1 for something far closer to where his…
Lewis Hamilton has candidly admitted that his frustration boiled over during the Dutch Grand Prix…
The FIA has drawn a firm line under the backlash surrounding Franco Colapinto’s Dutch Grand…