No, alot of the internals are from Australian Companies including Yella Terra roller rockers and other various cranks,cams ect. I know it's the Windsor block But I wasnt sure if it was a changed head or the same head or where they come from. I know Tickford Port n Polish the head and do alot of other stuff. It's the closest engine to beeing Australian. Thanks guys.Cobra said:Just a quick question I was asked today which I didn't know the answer to, is the GT40P heads Australian or US sourced?