Ultimately, development on the engine was abandoned in favour of focusing on the FPF engine, which was already proven competitive in 1.5L form with side-draft Weber carburetors in the F2 races, and the entire stock of parts was sold to Andrew Getley in the mid-1960s. When the Formula One regulation changed to 3 Litres for 1966, Mr. Getley permitted Paul Emery to rebuild one FPE to 3 Litre format and fit it into a one-off Shannon steel monocoque chassis to make the Shannon F1 car named SH1 driven by Trevor Taylor at 1966 British Grand Prix. Bored out to 3 Litres and Tecalemit Jackson fuel injection installed, this Emery-built FPE produced 312 bhp on the dynamometer at Chrysler's Kew facility.