Performance Heads & Kits For Evolution Harley Davidson

For True Performance, Use Edelbrock Heads & Kits To Make That Harley Davidson Evolution Run Like It Should!!  This Is Bolt On Horsepower!! If you are going to go to the trouble of rebuilding your engine, do yourself a favor, ADD SOME HORSEPOWER!!  Slap in one of these Edelbrock Head Performance Kits, you will be amazed at the difference it will make!!

EVOLUTION BIG TWIN EDELBROCK PERFORMER HEADS

These emissions legal evolution Edelbrock heads are a direct replacement with stock heads for true, bolt-on performance in 80-inch bikes for great low-end torque. They provide a substantial power increase while working within the existing rpm range of the stock engine (idle to 5500 rpm) with stock pistons and valvetrain. The Edelbrock Head's intake ports are raised .125" for improved flow and velocity. Important Note: Evolution Edelbrock Performer heads are designed for flat top pistons only. Valve spring specs: maximum valve lift .580", 1.460" OD with dampener, installed seat pressure 165 lbs., installed height 1.730".

EVOLUTION BIG TWIN EDELBROCK PERFORMER RPM HEADS

Edelbrock heads Are The ultimate evolution heads for idle to 6000+ rpm power in 80-inch and larger engines...Edelbrock Performer RPM CNC-ported evolution heads provide superior flow for maximum power. Edelbrock Performer RPM Evo Big Twin evolution heads #1604, #1624 and #16041 have an 88cc combustion chamber that's great for stroker kits or engines with a turbo or supercharger. We recommend Edelbrock/JE pistons for 80-inch Evo engines with Edelbrock evolution Performer RPM heads, other engine sizes require modified stock or other aftermarket pistons.

If You Are Tired Of Loosing Races, Replace Your Stock Evolution Heads With Edelbrock Heads, Cams & Pistons, And Blow Your Competition Away!!  From the moment you crank that throttle at the line, From the massive burnout, thru every gear, you will feel the power that the Edelbrock Head & Performance kits made to your bike!!

SUPERIOR FEATURES OF ALL EDELBROCK HEADS All Edelbrock cylinder heads include high-grade stainless steel swirl-polished valves, ductile iron seats and guides, Teflon® valve stem seals, radius valve job, and heavy duty valve springs. They are made of A356 aluminum heat treated to T-6 specs. Edelbrock heads must be used with Edelbrock manifolds for maximum performance (see page 18 & 19). Valve spring specs for Performer RPM heads: maximum valve lift .650", 1.460" OD with dampener, installed seat pressure 175 lbs., installed height 1.800", titanium retainers and 7º locks. VELOCITY IS KEY FOR INCREASING PERFORMANCE The volume of air that a cylinder head can pass is important. While Edelbrock cylinder heads produce excellent cfm results, volume is just one component of effective air flow. Velocity is the other component, it is a measurement of how fast a given volume of air travels. With The Engineering That goes into machining every set of Edelbrock Heads, High-velocity airflow provides quick throttle response, awesome acceleration and excellent mid-range power. Edelbrock heads produce a balance of volume and velocity.

1. Rectangular Shaped intake Port Built Into Every Set Of Edelbrock Heads!! Edelbrock's unique rectangular-shaped intake ports are the first V-Twin motorcycle ports designed to create a laminar flow for the incoming air-fuel mixture charge. With Edelbrock heads, the flat floor of the intake port slows the lower section of the charge down as it crosses the lower short side radius; this flow rate is equal to the speed of the upper charge as it moves along the top of the port. When Edelbrock shapes the intake port of the heads, the smoother flow eliminates charge turbulence and makes for a more evenly atomized intake mixture. This is the most efficient port shape that can be developed in the working space available in V-Twin cylinder heads. An Edelbrock intake manifold with matching rectangular ports must be used with all Edelbrock heads.	2. Dual-Quench Combustion Chamber The dual-quench combustion chamber of the Big Twin and Twin Cam Edelbrock heads features a patented design that creates more turbulence on the compression stroke for a more uniform mixture which prevents pinging and detonation. With Edelbrock heads, this results in more efficient combustion for more power from idle to redline, better cruising capabilities and better mileage.	3. Edelbrock's "D" Shaped Exhaust Port Edelbrock's "D" shaped exhaust port is designed to provide a larger area for increased flow and velocity as well as to create a mismatch between the exhaust pipe and the exhaust exit. This purpose-built mismatch reduces "power-robbing" reversion by keeping the majority of the exhaust gasses from going back into the engine.