Since acquiring our Fox-body Mustang Ultra Street chassis, we’ve been hard at work getting it ready for the new drivetrain and upgrading it from stem to stern. In this installment, we’ll take a look at the completed small-block Ford engine, the turbocharging system we went with, the FuelTech ECU, and the fuel system.
SBF to the Front
When it comes to small-block Ford performance, Bennet Racing Engines and KBX Performance have a vast amount of knowledge between the two of them, and KBX has been the driving force behind many Ultra Street competitors, as well as NMRA Renegade and NMCA Xtreme Street champion Joel Greathouse whose Mustang is powered by a turbocharged SBF.
For our Ultra Street project, there are many engine and power adder combinations to choose from, but Bennett Racing steered us towards a 9.5-inch deck-height small-block Ford with a turbocharger. The foundation of this powerplant is a Carroll Shelby Engine Company cast aluminum block that Bennett has used in grudge and X275 applications good to high-3.9-second, 1/8-mile runs. The cylinders were hogged out to 4.125-inch, and the lifter bores were also enlarged to accommodate more substantial lifters.
Complementing the 4.125-inch bore size is a 3.75-inch stroke length from a Callies Performance Products’ Magnum crankshaft to provide 400 cubic inches of displacement. Spinning on a set of Calico-coated bearings, the crank swings an octet of aluminum GRP connecting rods that have been cam-cut for more clearance at the big end for the 55mm camshaft. Bennett went with Diamond Racing pistons that feature gas porting, an anodized coating, and are made specifically for Bennett Racing’s Trick Flow Specialties 265 cylinder heads, which we’ll talk about in a bit. Wrapped in Total Seal piston rings, the slugs stay connected thanks to the use of .200-inch wall thickness piston pins which are chosen based on M1 fuel use and the expected horsepower load.
Getting A-Head of the Competition
Cylinder heads are perhaps one of the engine components where a good deal of power can be gained or lost. Bennett Racing has been using Trick Flow Specialties cylinder heads since Trick Flow began making them, and both companies have continued to refine them. For this build, Bennett chose its Trick Flow Specialties High Port 265RX cylinder heads.
Bennett starts with Trick Flow high-port raw castings and then put them through an extensive CNC-machining that includes the intake and exhaust…
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