Home » Modified Cars

Gas Flowed Heads – Performance modification

17 June 2010 3 Comments

Many things go on in the head of your cars engine. Mainly the air coming into the engine flows through the head and into the cylinders via the open inlet valves and is expelled through the exhaust outlet. The air moving into an engine is traveling at such high speeds and any turbulence caused can substantially alter the flow of the air thus making your engine less responsive.

Think of it like this, the better the aerodynamics on a car the faster it goes and the less drag it creates right well its the same with your cars cylinder head

When you gas flow a head the aim is to get the air moving as freely as possible through the head. Where possible the physical area inside the head is increased to allow for greater flow of air.

Investing in larger valves will also enable the air to flow into the engine more freely. The larger the engine capacity the bigger the benefit of gas flowing the head as more air is moving around. Gas flow is measured on a flow bench and as the head is worked it is remeasured. A professional will get a feel for the type of channels that need to be made inside the head.

Attention should be paid to the engines ports. These are the holes that air is let into the cylinder head via the intake manifold and the exhaust manifolds connect to holes (ports) on the other side of the head. Try aim to get the holes matched up avoiding steps or ridges for smooth inlet and outlets from the engine. Porting can be carried out with a drill with a grinding wheel and should be performed with long sweeping strokes to avoid cutting new grooves and steps into the ports.


  • Sven said:

    nice post. thanks.


  • Engines For Sale said:

    Very good post. This should be left to a professional unless you know what you are doing or first experimenting on old heads etc. A lot of power can be added especially if you are changing to higher duration camshafts as well as turbocharging the car.


    Blair Reply:

    Very true….


Leave your response!

Add your comment below, or trackback from your own site. You can also subscribe to these comments via RSS.

Be nice. Keep it clean. Stay on topic. No spam.

This is a Gravatar-enabled weblog. To get your own globally-recognized-avatar, please register at Gravatar.