I can’t even remember who said it now, it was that long ago,” Lee Wilson comments on someone’s statement that Holden 308 motors couldn’t make any power. That was all it took to tip him over the edge and set him on a quest to prove them wrong… whoever they may be!
Lee had owned the car for a few years, just with a 3-litre straight-six in it, but the plan was always to drop a 308 in so it had a bit more power and street cred. If he looks back now, he would surely have noticed the signs that it was spiralling into a full-on build. One of those signs should have been when the decision was made to give the car a quick paint job before the motor was dropped in…
As you can tell, that quick paint job turned out to be a quality job, and it looks just as good now as it did all those years ago when it was first sprayed. It was around the time that the build began when Lee started hanging out with a few other guys and girls who had supercharged engines, and through helping them out with their builds, he soon met Al Shadwick from Al’s Blower Drives. Over the years Al and Lee have become good mates, helping each other out on various projects (Lee’s a fabricator by trade, so comes in handy).
As you can imagine, having a relationship with New Zealand’s top supercharger expert can come in handy when you’re trying to build a big power street motor. Al and Lee devised a plan that would see the 308 block retained, but a 304 crank installed, along with Scat H-beam rods and Wiseco pistons. While the capacity may be small in comparison, the emphasis was put on making the engine breathe efficiently to make the most of what it had to offer. To do this, Yella Terra Dash-9 CNC ported heads were chosen and fitted with roller rockers from the same catalogue. Add some Ferrea stainless valves, a blower cam and a port-matched intake and you’ve got a combo that is almost unbeatable with a Holden block. Of course, it’s what sits above all this that makes the power and makes the car into a head turner. That setup consists of a billet Blower Shop 6/71 supercharger and a pair of 650cfm Demon carbs.
Currently the blower is three percent overdriven, which should make the combo good for around 600hp. The exact figure is unknown as, since an oil pump drive failed resulting in the end being chewed off the camshaft, a new more aggressive cam has been fitted. With the old cam, it made 530hp, so it’s fair to say that Lee’s not stretching the truth at all with those numbers.
Since the plan was only ever for the car to be (more…)