Lowly Adelaide produced a stunning form reversal to trounce arch rival Port Adelaide by 32-points in their AFL grudge match.

Sparked by four goals to livewire forward Graham Johncock, Adelaide triumphed 17.17 (119) to Port's 13.9 (87) at AAMI Stadium.

The victory was Adelaide's first against Port in the past eight encounters between the fierce South Australian rivals, and kept the Crows' finals hopes alive.

Johncock inspired Adelaide with a four goal burst in the second quarter that set his side on course for a remarkable upset win before 44,733 people.

The Crows entered tonight's match with just one victory from six matches this season, in stark contrast to Port's 5-1 win-loss record this year before tonight's encounter.

But Port relied solely on champion centre-half forward Warren Tredrea, who kicked seven goals in a dominant display.

Tredrea was simply sensational, commanding Port's forward line with sheer power and class which the Crows could not counter.

But the acting Port captain's sterling performance was unmatched by his teammates, who appeared sluggish and were consistently beaten to the ball by their Adelaide opponents.

Crows captain Mark Ricciuto continued his brilliant early season form in gathering 36 possessions was particularly prominent in the third term when the match was in the balance.

Ricciuto and fellow onballer Tyson Stenglein feasted on a plethora of opportunities from ruckman Matthew Clarke, while wingman Brett Burton was another midfielder who Port was unable to subdue.

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