"It is a major change for us and a lot of Ford supporters - no doubt some will come with us, but there'll be some who are unhappy but not much we can do about that.''
Stone says the writing was on the wall.
"The number of Falcons getting sold now has just dropped right off and I don't think there's any way that Ford can justify their investment in V8 Supercars at what it was in the glory days if you like.''
He says it's going to be somewhat of a hands off approach for them when it comes to engines, having done all their own up until now.
"The engines will all get done in Germany, they'll be serviced here in Australia but when there's major rebuilds going on, they'll go back to Germany initially and so that's a big change and it'll be interesting to see how it goes. I'm confident it'll be fine.''
They become the fourth manufacturer to be involved with V8 Supercars next year, with Nissan already signed up for next season.