The increased penalty is embarrassing but
meaningless with only 20 cars competing and grid drops not
carried over to subsequent races.
The Belgian was set to start last anyway.
Vandoorne was hit with a 35-place penalty after Honda replaced
the power unit, a breach of regulations limiting the number that
a driver can use during the season.
The unscheduled gearbox change brought a further five-place
drop, while the further change of power unit incurred another
25-place hit.
Honda said they had detected a potential issue in the engine
after Friday practice and had decided to change it as a
precaution.
Sunday's race is the rookie's first home grand prix and he will
be the first Belgian to appear before his countrymen since
Jerome d'Ambrosio in 2011.
Vandoorne has scored just one point so far this season with
ninth-placed former champions McLaren struggling with poor
engine reliability and a marked power disadvantage at fast
circuits such as Spa.
(Reporting by Alan Baldwin; Editing by John O'Brien)
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