Marcos Ambrose.

Marcos Ambrose. Photo: AFP

FORMER V8 Supercars champion Marcos Ambrose is set to continue in American stock car racing after seriously considering a return to V8s next year with a leading team.

Ambrose is poised to confirm he has re-signed with NASCAR legend Richard Petty's Ford team following weeks of uncertainty about his future in the US.

While he waited on Petty to secure renewed backing from Ford, he was engaged in secret talks with Ford Performance Racing to make a surprise comeback to V8 racing next year.

But with confirmation that Richard Petty Motorsport will retain the support of Ford in NASCAR's showcase Sprint Cup, Ambrose has decided to continue his quest to conquer the series' signature oval-track races.

It is understood Ford's continued backing of RPM was contingent on Ambrose, who has been associated with the car-maker for most of his career, staying with the team.

His new deal for a third season with Petty was in the balance for so long that he went close to agreeing to return to Australia to join FPR after seven seasons in NASCAR.

Ford-backed FPR is expanding to four cars next year with the addition of an entry owned by forklift tycoon Charlie Schwerkolt, who was working with the team to raise sponsorship to fund Ambrose in his new Falcon. Schwerkolt is returning to car ownership after leasing his entry to V8 legend Dick Johnson for two years as part of the settlement of their failed partnership.