Table:
text: Piercarlo Ghinzani
Complete Formula One results
Complete Formula One results
Year_ Entrant Chassis Engine Pts_
1981 Osella Squadra Corse Osella FA1B Ford Cosworth DFV V8 0
1983 Osella Squadra Corse Osella FA1D Ford Cosworth DFV V8 0
1983 Osella Squadra Corse Osella FA1E Alfa Romeo V12 0
1984 Osella Squadra Corse Osella FA1F Alfa Romeo V8 (t/c) 2
1985 Osella Squadra Corse Osella FA1F Alfa Romeo V8 (t/c) 0
1985 Osella Squadra Corse Osella FA1G Alfa Romeo V8 (t/c) 0
1985 Toleman Group Motorsport Toleman TG185 Hart Straight-4 (t/c) 0
1986 Osella Squadra Corse Osella FA1F Alfa Romeo V8 (t/c) 0
1986 Osella Squadra Corse Osella FA1H Alfa Romeo V8 (t/c) 0

Question: What is the average potency of Alfa Romeo v12 after 1983 under Piercarlo Ghinzani?