632CI BIG-BLOCK HQ HOLDEN ONE-TONNER AT DRAG CHALLENGE 2016

Holden HQ One tonner big block

CUBIC inches rule when it comes to making power without a blower, turbos or nitrous, and with 632 cubes, Steve Micallef has plenty in his Holden HQ one-tonner.

Holden HQ One Tonner Big Block 2“To be honest the tonner was supposed to be a burnout car,” he said. “But after I did Drag Challenge with Alon Vella last year I thought: ‘Screw that!’ I rang my engine builder from Calder on the last day and said: ‘Stop what you’re doing; it’s all changing!’”

Holden HQ One Tonner Big Block EngineAfter doing the trip last year, Steve had a fair idea of what he needed to chew up those long drives – a streetable big-block with plenty of power. Built by Kelvin at CDA Engine Reconditioning in Dee Why, the 632-cube big-block produces 970hp, which helped push the Holden trayback to an easy 9.42@144mph best at Drag Challenge and take out the Mothers Outlaw Aspirated class.

Holden HQ One Tonner Big Block 6Built with the help of Steve’s mate Shaun, who also came along for the ride, the HQ isn’t exactly light at 3720lb (with driver). Because it was getting built for frying tyres, the whole back end is made out of 3mm sheet metal, but it does help put some weight over the rear end so the four-link can plant the tyres.

Holden HQ One Tonner Big Block 3“I chose to run an 11.5-inch slick to put me in the Outlaw class so I wouldn’t be competing against my mate Alon,” Steve said. “But next year I think we might go for steeper gears and a Gear Vendors, and maybe some more horsepower.”

As it was a new combo, the guys didn’t have much time to sort things out; they ran a 9.30 in testing at Sydney Dragway and melted the dizzy cap.

Holden HQ One Tonner Big Block 1“I’m glad it did that,” Steve said. “I thought I better grab some spares so I went to Rocket and bought another six caps. Good thing I did, because I melted one every day of Drag Challenge; I haven’t even looked at what the problem is yet.”

Holden HQ One Tonner Big Block 5Other than that, the tonner ran flawlessly, running on pump 98-octane on the street and using MS109 at the track. “We’d go up five jet sizes at the track and then back it down again for the street,” Steve said.

“I loved the driving, but to be honest my favourite part was the end. I was just relieved to make it all the way.”

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