PUMPING IRON
ROB CINANNI’S HK MONARO GETS A REAL WORKOUT FROM A BLOWN SMALLBLOCK SENDING AROUND 800 HORSES TO THE REAR WHEELS
Rob Cinnani turned a bare HK Monaro shell into an 800hp blown small-block beauty
IFIRST spied Rob Cinanni’s HK Monaro back in early 2016. It was parked amongst around 600 other cars at the start point of Big Al’s Poker Run, of which there would have been at least a dozen other HK-T-G Monaros on show. I’m not sure what made it stand out from all the others; it could be that I’m a sucker for Warwick Yellow HK Monaros, or the fact it sat just right on (at the time) Weld Racing rims, or maybe it was the way the injector hat just stuck out above the bonnet. Most guys running blown motors want the whole world to know and do their utmost to get as much of it as possible out in the sunshine, but Rob took a different, stealthier path. Back then, the hat was polished, but it has since been given a black finish to make it even more low-key.
But let’s backtrack a little to just a couple years before I laid eyes on the HK, when Rob bought it as a stalled project from Adelaide.
“When I bought the car it was basically a bare shell – no glass, the guards and bonnet weren’t even on it, just the body, doors and bootlid,” Rob says. “It was already mini-tubbed and the glass and interior were included, but it was all just thrown in the car. It had a smallblock 400 Chev in it and ran 11.0 before I got it, had the timeslips and all, so it went all right.”
Most people would probably be happy with that, but as Rob’s already got an HQ Monaro coupe in the shed that was running 10.50s 18 years ago naturally aspirated, he knew he had to step it up a bit. The motor is still around the 400-cube mark, but it’s based around a Dart Little M block that’s been built to take the punishment an 8/71 blower can dish out using a Callies Magnum crank with a big-block snout and double keyways. There’s a set of Carrillo rods, and the JE pistons squeeze the E85 with an 8:1 ratio.
We all know that none of that is worth a damn if the heads aren’t up to the task, but Rob definitely didn’t skimp in that area. A set of AFR 245 NPP (no pushrod pinch) heads are fitted with Crower stainless shaft rockers and Manton pushrods. The cam is a custom solid-roller grind from Moose at Ranch Automotive Engineers, who also did all the machining work on the engine as well as some other choice modifications.
“The manifold that came with the blower kit was really nice, but it was another 45-50mm higher than what’s on there now,” Rob explains. “I had to get another manifold – the lowestprofile one you get on the market – and then Moose welded it up to match the ports on the heads. It was a bit of stuffing around, but it was worth it because all you can see is the very top of the pulley and the hat. If you didn’t have a mate with a machine shop that could weld and machine it, you wouldn’t do that shit.”
Rob’s a mechanic by trade, so he screwed everything together, but he reckons that’s the easy part.
“Where the work goes in is the machining, really, so Moose should take the credit. He’s so meticulous, it’s a pain in the arse!”
Sitting pretty on top of the stout small-block is an 8/71 with a billet case and rotors from The Blower Shop that is topped with an Enderle bug catcher. To my eye, these are the sexiest injector hat; they just look the business and suit the era of the car to perfection.
While it might look all old-school, there’s a bit of technology hidden away, with an EFI system controlled by a Bigstuff3 ECU, which took a little bit of work to get right.
“They sent me a map, but it was just enough to fire it up, it wouldn’t do anything else,” Rob says. “My mate Trevor Morrison from Mad Max Racing and I got it going. We put it on a dyno but it wouldn’t rev up over 6400rpm. Still made 765hp at the wheels, so it’s definitely going to go up around the 850 mark when we turn it to 7500. The ignition box failed on me in the end, so at least now we know what the problem was.”
With that much grunt, the rest of the driveline needed to be equally strong, so Rob went straight to the US and got a fully manualised, reverse-pattern Turbo 400 from Abruzzi Racing. The car was already fitted with a nine-inch, but that’s been upgraded to 35-spline, fitted with a Moser Wavetrac LSD and converted to disc brakes.
The mechanicals were easy for Rob, but getting the bodywork and trim sorted meant calling in some more mates to help out.
WHEN I BOUGHT THE CAR IT WAS BASICALLY A BARE SHELL – NO GLASS, THE GUARDS AND BONNET WEREN’T EVEN ON IT