Performer RPM Cylinder Heads - Single - Complete Small Block Ford, 1.90" Intake valve, great torque and horsepower up to 6500 rpm

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.

• Designed for 289-302-351-Windsor Ford engines.
• Maximum performance in the 1500-6500 rpm range for high performance street.
• 1.90" intake valves are for use with stock pistons and high-flow 2.02" intake valves work with pistons notched for valve clearance.
• Hardened pushrods required.
• Will not accept rail rockers.
• 289-302 V8s require Head Bolt Bushings # ED9680

Combustion chamber volume: 60cc
Intake runner volume: 170cc
Exhaust runner volume: 60cc
Intake valve diameter: 1.90"
Exhaust valve diameter: 1.60"
Valve stem diameter: 11/32"
Valve guides: Manganese bronze
Deck thickness: 5/8"
Valve spring diameter: 1.46"
Valve spring maximum lift: .575"
Rocker stud: 3/8"
Guide plate: Hardened Steel
Pushrod diameter: 5/16"
Valve Angle: 20°
Exhaust port location: Stock
Spark plug fitment: 14mm x 3/4" reach, gasket seat
Made In: USA