Performer RPM heads are perfect for street performance, daily drivers, street rods and muscle cars where seat-of-the-pants performance is needed. These heads give great torque and horsepower up to 6500 rpm.

• Direct bolt-on heads for 1961-76 390-427-428 Fords.
• 428 Cobra Jet-sized valves promote excellent flow for streetable power.

Combustion chamber volume: 72cc
Intake runner volume: 170cc
Exhaust runner volume: 125cc
Intake valve diameter: 2.09"
Exhaust valve diameter: 1.66"
Valve stem diameter: 3/8"
Valve guides: Manganese bronze
Deck thickness: 5/8"
Valve spring diameter: 1.55"
Valve spring maximum lift:.600"
ng>Rocker stud: N/A
Guide plate: N/A
Pushrod diameter: 3/8"
Valve Angle: 13°
Exhaust port location: Stock
Spark plug fitment: 14mm x 3/4" reach, gasket seat
Made In: USA