Only available from 2012 to 2013, the S197 Ford Mustang Boss 302 represents one of the high-water marks for fifth-gen Mustang performance. And though the Boss 302 package included vital upgrades to the Mustang GT’s suspension, aerodynamic, and other key systems, the real Boss 302 magic was found under the hood. That’s because the 2012-13 Boss 302 Mustangs got a reworked version of the 5.0L Coyote V8 developed by Ford under the nickname “Road Runner.”

After all—roller skates, ACME rockets, and giant slingshots aside—the only thing faster than a Coyote is a Road Runner.

Borrowing heavily from Ford’s 302R racing program, the end result of Project Road Runner was a 444 horsepower, naturally aspirated monster. If you’re keeping track at home, that made it the most powerful NA V8 motor to ever be stuffed into a Mustang.

In other words, the Road Runner was a perfect powerplant for the upcoming 2012 Boss 302.

But suffice it to say, the Road Runner is far more than a Coyote with a tune. It boasts significant differences from the typical 5.0L Ford Modular V8 in a Mustang GT. Take one apart, and you’ll find things like a revised intake, stronger internals, and totally unique cylinder heads—all necessary to accommodate the Road Runner’s performance diet of high rpm and high compression.

So the Summit Racing tech experts grabbed their notebooks and wrenches, and compiled all the specs and data they could find on the Ford Road Runner V8 engine. See it all below.

Click the links below to learn about the other engines in the Ford 5.0L Coyote family.

Special Hat Tip to Summit Racing’s John Jones, Gary Vicich, and Matt Strebler for their hard work in collecting and organizing this vital information.


2012-13 Ford Mustang Boss 302 Road Runner Engine Spec Guide


2012-13 Ford Mustang Boss 302 Road Runner Engine Performance Specs
Compression Ratio11.0:1
Horsepower Rating444 hp
Torque Rating380 ft.-lbs.
2012-13 Ford Mustang Boss 302 Road Runner Engine Application & VIN ID
VIN 8th DigitU
Years2012 & 2013
ModelMustang Boss 302
2012-13 Ford Mustang Boss 302 Road Runner Engine Block Specs
Casting NumbersBR3E-6006/6015
MaterialAluminum, Steel Sleeve
Displacement5.0L (302ci)
Bore Diameter3.630 in.
Stroke3.650 in
Deck Height8.937 in.
Bore Spacing3.937 in.
Thrust Bearing Location#5 Main
Main Cap Style4 Bolts with 2 Lateral Cross-Bolts (All 5 Mains)
Main Housing Bore Dia.2.851 in.
2012-13 Ford Mustang Boss 302 Road Runner Rotating Assembly Specs
Piston MaterialForged
Piston StyleDomed, Valve Reliefs
Piston Volume4.451cc
Wrist Pin Diameter0.865 in.
Connecting Rod MaterialSinter Forged
Connecting Rod StyleI-Beam
Connecting Rod Length5.933 in.
Connecting Rod Weight618 grams
Crankshaft MaterialForged
Crankshaft Casting Number BR3E-XXXX
Crankshaft Main Journal Dia.2.657 in.
Crankshaft Rod Journal Dia.2.086 in.
Oil SquirtersNo
2012-13 Ford Mustang Boss 302 Road Runner Cylinder Head Specs
Casting NumbersM-6050-M50 (Left)
M-6049-M50 (Right)
MaterialCNC Ported Aluminum AL356
Combustion Chamber Volume57.5cc
Intake Port ShapeOval with Dimple
Intake Runner Volume193cc
Exhaust Port ShapeRound
Exhaust Runner Volume100cc
Intake Valve Diameter1.468 in.
Exhaust Valve Diameter1.252 in.
Cylinder Head Bolt StyleTorque to Yield (TTY)
Cylinder Head Bolt Size12mm x 1.75 (10)
2012-13 Ford Mustang Boss 302 Road Runner Camshaft Specs
Duration @ .050 in. 263° (Intake)
290° (Exhaust)
Valve Lift0.511 in. (Intake)
0.511 in. (Exhaust)
Lobe Separation Angle (LSA)116°
Cam Gear Attachment1 Bolt
Twin Independent Variable Cam Timing (Ti-VCT)Yes
2012-13 Ford Mustang Boss 302 Road Runner Valvetrain Specs
Valve Spring StyleBeehive
Intake Valve MaterialChrome, Sodium Filled Stem
Intake Valve Diameter1.468 in.
Exhaust Valve MaterialChrome, Sodium Filled Stem
Exhaust Valve Diameter1.252 in.
Other Key 2012-13 Ford Mustang Boss 302 Road Runner Engine Specs
Intake ManifoldGray Composite, Fixed Runner
Throttle Body80mm
Throttle ControlElectronic
Fuel Injector Part NumberBR3Z9F593A
Fuel Injector Flow34 lbs./hr. @ 58 psi
Flex Fuel/E85 CapableNo
Fuel Injector Length1.900 in. Between O-Rings
Fuel Injector ConnectorUSCAR / EV6
High Pressure Fuel PumpNo
Camshaft Sensor LocationTiming Cover
Oil PanSteel, 8.5 Quarts, Rear Sump
Oil PumpGerotor
Firing Order1-5-4-8-6-3-7-2
Redline7,500 RPM

red ford mustang boss 302 s197 2012, 2013