SPA-FRANCORCHAMPS (REUTERS) - McLaren drivers Fernando Alonso and Jenson Button will start last in Sunday's Belgian Formula One Grand Prix after being hit with heavy grid penalties for changes to their Honda power units.
Spaniard Alonso was given a drop of 30 grid positions, despite only 20 cars being entered for the race, while British team-mate Button collected a marginally less draconian 25-place penalty.
The race stewards issued statements containing a long list of components that had been changed in breach of the regulations.
In Alonso's case, the double world champion picked up a 10-place penalty for using his seventh internal combustion engine of the season.
There were four five-place penalties for replacing other elements of the power unit.
Honda have been allowed a maximum of five power units per driver this season, one more than other teams because they are new manufacturers.
Button collected a 10-place hit for using an eighth turbocharger and three five-place penalties for exceeding his allocation of other parts.