Thousand-horsepower street engines are not that uncommon in a variety of configurations these days — including LS, Mod motor and import V6 platforms. Besides more emphasis on boost, there have been incredible advancements in late-model head design and street-friendly cam profiles.
But a blown big-block like this 572ci Rat built by Tennessee-based Precision Race Engines still commands the most attention while cruising the boulevard. The eye-catching 8-71 blower and imposing exhaust rumble make it the most jaw-dropping powerplant on the street — even if it isn’t the fastest or most nimble.
“We’ve built a number of these engines,” says Precision’s Mark Davis, noting that idle quality and off-idle response are often the top priorities for customers.
This engine is based on a Dart iron block and includes a Callies forged-steel crank, Callies steel rods and RaceTec 9.5:1 pistons. The bottom side comprises a Moroso 7-quart pan and Melling high-volume oil pump.
“The cam is just big enough for the cubic inches with a lobe separation to keep the idle friendly,” says Davis.
Precision massaged a set of Pro-Filer heads before joining the short-block along with a Weiand manifold, Dyer’s 8-71 supercharger and a pair of Quick Fuel 950 cfm carbs. Then it’s up to the MSD ignition to light the candle.
Running with a 4-percent underdrive and on 93-octane fuel, the engine pulled 1,019 horsepower at 7,000 rpm on the dyno with 860 lb-ft of peak torque.
“You could step up to 10 or 15 percent overdrive and get 1,150 or more horsepower,” says Davis, noting that the engine will go into a ’79 Camaro.
Such an engine will cost around $25,000 but for those car owners looking for the ultimate expression in street muscle, here’s the ticket!