Allardyce brought in Carl Jenkinson, Aaron Cresswell, Cheikhou Kouyate, Alex Song, Diego Poyet, Morgan Amalfitano, Mauro Zarate, Diafra Sakho and Enner Valencia, and so far, it's paying dividends.
The opening goal against City was scored by one of their new signings, as Amalfitano tapped home a pull back from Valencia to put West Ham in front, bagging his second goal for the club since joining from Marseille this summer.
The former West Brom loanee has impressed in Allardyce's diamond midfield, but with just a 12-month contract at Upton Park, the 29-year-old says he wants to stay and extend his deal.
"I hope to contribute and to stay here. I never had any doubts about making this choice," said the Frenchman.
"I just had to prepare myself physically in line with what I did with Marseille. Then I could get back to my best. I'm adapting well and I hope it carries on this way in the future. But we can't rest because there is still a long road ahead."