Born in Siena, Spalla was mainly active in Spaghetti Westerns, usually playing roles of Mexicans, gunfighters and outlaws.

[1] His first roles of weight were in 1965, in Marino Girolami's Bullet in the Flesh and in Giorgio Ferroni's Blood for a Silver Dollar.

[1] In the 1970s he focused his activity in the subgenre of comic spaghetti, and his career basically declined together with Italo-Western.

[1] Outside this genre, Spalla's credits include Eduardo De Filippo's Shoot Loud, Louder...

I Don't Understand, Lucio Fulci's The Conspiracy of Torture, and Pasquale Festa Campanile's Hitch-Hike.