01/08/2026
ACL bearings still kicking ass.
Repco had a habit of taking engines nobody expected to race and making them win championships. In the 1960s, they acquired surplus Oldsmobile aluminum V8 blocks (from the engine GM had abandoned) and Phil Irving designed a Formula 1 engine around them. Jack Brabham won two consecutive World Championships in 1966 and 1967. A discarded American V8 won Formula 1. By 1970, Repco had a new project: take Holden's production 308-cubic-inch road-car V8, the engine that powered Australian family sedans, and turn it into a Formula 5000 race engine that could compete against purpose-built Chevrolet V8s in open-wheel racing. Same company. Same philosophy. Find an overlooked production engine. Re-engineer it. Win.
Phil Irving, the same engineer who designed the Brabham F1 engine, adapted Holden's 308 V8 block for open-wheel competition. The production 308 made approximately 220 HP in a Holden Kingswood sedan. Irving's racing version made 495 HP at 7,500 RPM. More than double the power from the same basic block casting. The modifications were comprehensive: four-bolt main bearing caps machined into blocks sourced strengthened from the factory. Special steel crankshaft replacing the production cast unit. Lightweight forged pistons. Wade performance camshaft. Heavily reworked cylinder heads with larger valves and reshaped ports. Lucas mechanical fuel injection with individual slide throttles and long velocity stacks. Dry-sump lubrication system with belt-driven external oil pumps. Dual-coil Bosch ignition. More than 150 special components designed and manufactured by Repco's subsidiary Redco Pty. Ltd. in Melbourne. The engine revved past 8,000 RPM from an architecture that redlined at 5,200 RPM in the family sedan.
The Repco-Holden's advantage over the dominant Chevrolet V8s wasn't peak horsepower. At 495 HP, it was roughly equal to the 500-HP Chevrolet 302s and destroked 350s running in Formula 5000. The advantage was mid-range torque. John McCormack, who raced both Chevrolet and Repco-Holden engines, was adamant that the Repco-Holden was the better engine because its torque band was broader and more useable through corner exits where throttle modulation mattered more than peak power. A few flat-plane crankshaft versions built in 1973 and 1974 pushed output closer to 525 HP but were less reliable. The standard cross-plane version remained the preferred choice because it won races through durability and drivability rather than outright speed.
Frank Matich won the 1970 Australian Grand Prix in a McLaren M10B powered by a Repco-Holden at the engine's debut race. Matich then designed and built his own chassis (the Matich A50 through A53, constructed by the Commonwealth Aircraft Corporation from aluminum and titanium monocoques) specifically around the Repco-Holden engine. Kevin Bartlett campaigned Repco-Holden-powered Lola T300s and T332s. McCormack won the 1975 CAMS Gold Star (Australian Drivers' Championship) in an Elfin MR6 with the Repco-Holden. John Goss won the 1976 Australian Grand Prix at Sandown in a Matich A53 Repco-Holden. The development work Repco did on the 308 for racing spun off directly into Holden's road car program: the L34 performance package for the 1974 Torana SL/R 5000 used stronger rods, an improved crankshaft, lightweight flywheel, baffled sump, and roller rockers that all originated from the F5000 program. A family sedan engine that became a race engine that became a better family sedan engine. Repco's specialty: making overlooked engines win.
