The Giants booted all five goals of a gripping final term to snatch a 10.11 (71) to 8.9 (57) stirring win on the road and climb over the Crows to the brink of the top eight.
Skipper Toby Greene sparked the Giants' comeback with the first major or the final term but it was veteran Daniel Lloyd that booted the sealer in a fiery clash on Saturday night.
The Crows led by 17 points at the last change but were then held goalless as the Giants again surged past them after overcoming an early 31-point deficit against the same team in round one.
Lachie Whitfield was sublime in his 200th AFL match for the Giants, collecting 28 disposals and 425 metres gained, while Josh Kelly bounced back from a rare quiet game with 28 touches and nine clearances.
Kelly added the second goal of the final term and Greene finished with three majors as the Giants (9-8) confirmed their finals credentials and moved up to ninth place.
The Crows (8-9) missed an opportunity to reclaim a spot in the top eight with just their third loss from 10 matches on home turf this season to spoil former captain Rory Sloane's 250th match.
Current skipper Jordan Dawson (27 disposals) battled hard for the Crows along with Rory Laird (33, one goal) and Brodie Smith (27) but they ultimately paid the price for failing to take their chances in a heated contest.
A fired-up Josh Rachele was involved in a running battle with Harry Perryman and the Crows will also be sweating on the review of a report for the young gun's high hit on Jack Buckley.
The two finals contenders went goal-for-goal early with the Crows' key forward Riley Thilthorpe slotting a set shot after the siren to grab the lead at the first change.
The Crows pulled away with three goals to none in the second term as their midfield got on top, then held the Giants at arm's-length until the visitors stunned them with a final-term fightback.
GWS next host Gold Coast at Manuka Oval on Sunday, while Adelaide will be out to turn around their form on the road when they face Melbourne at the MCG the same day.
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