HDT Brock Commodore VK

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Holden Dealer Team

HDT "Brock" Commodore VK

1984 - 1986
5.0 ltr. V8
177kW (Group III) to 196kW (Group A)
4/5 spd. man; 3 spd. auto
Top Speed:
215 km/h
Number Built:
5 star
HDT VC Commodore
HDT "Brock" Commodore VK
Reviewed by Unique Cars and Parts
Our Rating: 5


The HDT Commodores would be initially released as just two models, the HDT Commodore SS and HDT Commodore SS Group Three. Other models would follow, including the now highly prized and collectable “Group A”.

The HDT SS carried over the same grille from the donor VK Commodore, but had a small rear spoiler and 15x7 HDT wheels shod with Uniroyal ER60H15 tyres fitted.

But it was the Group Three that was creating all the interest, with its additional air dam, bolder side skirts, rear under-tray, letterbox grille and larger rear spoiler.

A rearward facing bonnet spoiler and bonnet wind splitters that ran atop the front guards were popular options. Colour options were restricted to either silver or white, the previous black never proving popular but we cannot determine just why red was abandoned.

Under the bonnet, the engineers enlarged the cylinder head ports, while the combustion chambers were gas flowed by Perfectune, before the engines were sent back to HDT for final assembly, including fitment of the bigger than standard valves.

Bilstein gas pressure shocks were fitted, along with a reinforced front say bar. Finally, the car was fitted with three-piece 16x7 alloys shod with Pirelli P7 225/50x16 tyres (although you could option Yokohama A008 or Goodyear NCT’s).

It was early in 1985 that Australian Touring Car racing moved from Group C to international Group A regulations, in the process changing the homologation rules to require some 500 examples of any car be manufactured before it could be raced. The General immediately turned to Peter Brock for the answer.

Starting out on the new “Group A” iteration, the HDT engineers needed to reduce the capacity of the trusty Holden 5.0 litre V8 to be less than 5 litres, so the first job was to reduce capacity from 5044cc to 4987cc – achieved by shortening the stroke from 77.8mm to 76.8mm.

In addition, the inlet manifolds were port matched and tubular exhaust headers were fitted. The engine was then mated to a M21 four speed transmission, the Group Three suspension fitted, the package then riding on 16 inch HDT alloys shod with Bridgestone Potenza 225/50 VR16 tyres. Cosmetically, the Group A carried over the Group Three’s grille, but was fitted with a “pimp my ride” large rear spoiler, and all were finished in “Formula Blue” duco.

Before the VK model was replaced, the HDT engineers had one more trick up their sleeve – the HDT Special Vehicles Calais Director. Most were built to customer order, and were twice the price of a standard Calais V8. Why would anyone want one over the Group A? You only needed to look at the corporate car-parks of the time, it would have been much easier to point to the Director and explain to your boss that your new company car was “merely” a Calais.

In all, some 700 HDT Special Vehicles Commodores would be manufactured, 200 Group Three's and 500 Group A's, while there were a handful of other HDT specials also.

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Also see:

HDT VK Commodore Specifications
HDT VK Brock Director Brochure
Reader Reviews page 1 of 1
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Dave Payne
Posted Recently
I have a HDT motor thinking it's a vk Brock black in colour with quadrajet carb can anyone Id this motor for me stamped HDT
Posted Recently
Hi Ryan, are the wheels still available.?
Posted Recently
Ryan have you sold your wheels, if not please call 0412676128
Posted Recently
Ryan call 0488000910 for 16 inch Brock wheels 048800910
Posted Recently
looking for Vk Calais 334 pack
Posted Recently
Guys i have a set of 4 16 x 7 Brock aero rims in excellent condition, stored for the past 15 years.
They are located in Sydney.
Posted Recently
Hi guys I am after a vk Brock to drive at my wedding I am from mill park area in Melbourne vic. I have 2 all ready just need 1 more if any one can help. Need to no asap call me on 0432020559 to work out a price cheers.
Posted Recently
i own a 333 and a 334 pack vk directors and am lookin for decently priced parts
Posted Recently
The wheels are ugly, and it would have been better if it was painted Holden red, but still its my favorite Holden.
Posted Recently
"The HDT Commodores would be initially released as just two models"
um, yeah, sure, so we'll ignore the LM5000, the first of the VK HDT cars, well done. Classic revision of history by internet.........
rare ss
Posted Recently
your can get a full repo vk ss trim on ebay for around 4-5k
Posted Recently
can anyone help me with some group a seats and interior
Posted Recently
1985 VK Calais director, does any1 have a rough secondhand price guide? I'm looken at i in white, it's been knocked round (motor wise) but the body is alright.
Posted Recently
r i p brock
Robert Browning
Posted Recently
I am looking for my old VK Brock Group 3 - Chasis BVK054087M Engine 4987 Number 30. Has anyone seen it please?
Posted Recently
i am looking for a set of 16x7 hdt aero pay good money for the good ones
Posted Recently
Info is very helpfull and i persanaly think the vk is the pick off the brock line /I have a mockup in the shed ex pursuit trying to get more info has full g/a body kit but was built by APV [advanced proformance vehicles ]in 1988 number 110 can anyone help me /who where they thanks Ian
Posted Recently
Greg: Do you still have the 16 x 7's?
What's "the right price?"
Posted Recently
Tim I have a set of 16 x 7 Hdt aero in real good conditon,i would sell
then at the right price
mick gee
Posted Recently
great detail on vk ss group a forget about GTHO VK SS GROUP A IS A LOT BETTER CAR I HAVE OWNED BOTH
Posted Recently
I am desperate for the 16/7 aero wheels to complete my "blue meanie" replica.
Does anyone have a set 4 sale?
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