Overhauling The Maserati Biturbo Spyder 2.8 Litre. So after days on end cleaning of prepping and cleaning, I took a day off and turned my attention back on to the engine. This time taking out the valves from the cylinder head along with dismantling the turbos which came as no surprise... more damaged parts... worn out valve guides and cracked turbo housings. The Video taken and pictures shown are of my own property and is used for educational, criticism purposes. The whole work done is a non-profit production.