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186K V/S 186S

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.

Mike

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hr x2 generally had the 186s with 2 barrel stromberg and headers
most like you could option it in a special as well
some hr's had a 4 speed opal gearbox
limited slip diff was also optional
gauge cluster too was optional
dont think it really matters what year the engine is as holden didnt do matching numbers of engines to cars
i have seen a early hr fitted with twin carbs and 4 speed opal box
i think it was just mix and match back then what ever the customer ordered at the time

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HR X2and 186S are two different engine designations, 186S replaced X2.

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option came out in hd as twin strombergs and morphed into the two barrel strommy part way thru HR. the designation 186"S" was brought in just before HK. im not sure if hr's had the 186s badging

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186S HR Badging proliferated.

My uncle owned a 186S Badged HR from new.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

The 186S replaced teh 186X2 late in HR production. At the same time the 4 speed opel was released.

The engine number prefix/designation on both engines is 186K

186S engine number prefix/designation starts with HK release.

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Very late HRs may have gotten 186S prefixed engines, very early HKs may have gotten 186Ks, I don't think anybody really knows for sure and if there was any crossover there wouldn't have been many. Records for cars around that period were destroyed apparently. The February 68 engine you have is definitely HK though. 186S wasn't only available on Monaros, it was available on all KTG models except Brougham and GTS327/GTS350 as they were standard V8.

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HR was 186K twin stromy's then changed to 186K 2 barrel stormy. HK was 186S

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186 X2 was pre mid 1967 and 186 S mid 67 onwards. Both had 186K prefixes. X2 or 186S badge on front guard.

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Hi. I have a186 The engine number is simply K31378 it does not have a 186 prefix would you have any information on this

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Hi Guys - the engine number info and date of change to
WW Stromberg is in the Nasco 20 years parts book.

See photo put on main page.

Donno

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Donno

The 186S had a WW Stromberg carbie drilled slightly differently internally than the 253 V8 WW Stromberg carbie is a true story (I think?).

I have one rejetted from a Bedford Van 253 on my 186S Hr.

The only difference with the 186S carbies is they are stamped 23-201, 23-201A or 23-201B for Manual 186S carbies and 23-202, 23-202A and 23-202B for the Auto carbies.

I gather the first stamped 23-201 and the 23-202 were on the first 186S (HR K engines ?)Same manifolds on 186S or 186K engines.

The only difference was vs the earlier HD/HR X2 headers. The 186S headers are different to the X2 headers as the
1) front header has hole drilled through it for WW auto choke and 2) rear header has a sharper bend in flange outlet

Donno

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Donno

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