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Can anyone tell me if my assumption that the HR performance 186 remained stamped 186K right to the end of production of the HR, or as some has suggested a engine stamped 186S was introduced just before the end of production?
A couple of people have claimed that the HR had a 186S fitted right at the end of HR production, while I know the cam, crank and everything else was the same ( slight change to the head exhaust port )
I know that the HR 186 had a WW Stromberg carbie drilled slightly differently internally, and same looking manifolds, but actually different, the engine looked the same except for sump and colour.
I would have thought if it is stamped 186K it must be out of a HR and if it is stamped 186S it must be a HK engine, is this right?
One reason I ask is that I have a February 1968 186S which is after the HR production but before the HK Monaro production, can anyone shed some light as to what model it may have been from?
I can find no information regarding the HR change to 186 engine either 186A or 186K some books give the change from twin carbies to the WW Stromberg but there is nothing to suggest this was the same time as change of engine size.
I have a 186K dated December 1966 which may be an early 186K too, but I cannot tell.