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I have many people to thank for help over the years. I would never be able to thank you all individually but you know who I mean!

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Welcome to the all new Holden Heaven
This site was first established in 1999
HR X2 - 1966

The HR X2 was a lot different from the HD X2 in so many ways and at the top of the list was the 186 ci engine which many experts say was the best pre '86 engine there was!  Although only 5 bhp up on the 179 HD, it was it's flexability that helped make this car so likeable. The carburettors were a pair of BXCV2's with smaller venturis to give it more economy at lower speeds and reduced the flooding  that was normal for the HD. The power was now up there with the 225 ci Valiant!  There were two models of HR X2 with the first being the twin carburettor 3 speed and the the second being the 2 barrel 3 speed with the optional 4 speed which came midway thru 1967

Some other options  were: 
Limited-slip diff
Low profile tyres 
Power steering.

Even though it handled better than the HD X2 which used the same track as the EH, it was still far short of  being called a great handling sports car. 

In October 1966 Holden gave the HR a safety upgrade which included:
Front safety belts.
Windscreen washers.
Reversing lights.
Sunvisors.
Shatter-proof interior mirror. 

 Specifications
186 X2 pre-June 1967
186 cid - 6 cylinder inline (3050 cc)
Bore and stroke:3.625" (92.1 mm) x 3.00" (76.2 mm)
OHV with hydraulic lifters, single camshaft
Two BXCV2 downdraught Bendix Stromberg (ex 149ci)
Power output (DIN):145 bhp (108.2 kW) at 4600 rpm
Torque (DIN):184 lb/ft (248.4 Nm) at 2200 rpm
Compression ratio:9.2:1

186s X2 June 1967
186 cid - 6 cylinder inline (3050 cc)
Bore and stroke:3.625" (92.1 mm) x 3.00" (76.2 mm)
OHV with hydraulic lifters, single camshaft
Two barrel downdraught Bendix Stromberg with auto choke
Power output (DIN):145 bhp (108.2 kW) at 4600 rpm*
Torque (DIN):184 lb/ft (248.4 Nm) at 2200 rpm*
Compression ratio:9.2:1

*The figures I have for both 186 X2 engines are the same, but as far as I know the 186s was a little less powerful.

 Pics

Without too much in the way of handling the X2 still managed to be a good performer for those who wanted to enjoy a little more.  One of the best "big" cars on the road at the time.

The dash was still the same and many like this person used after market guages to keep a better eye on there mechanicals.