4ag 16v Stage 1

To increase the power and torque of your 4ag we need to either increase the airspeed into the engine or both airspeed and volume of flow.  Poorly developed heads result in increasing total flow only. This results in either a slow engine or an engine that comes on with an unusable rush of power. 

Amazon cylinder heads are tailored to your engine.  Each head is carefully re-worked step by step using a flow bench to find the hidden restriction which are not always visible to the naked eye.  They are matched to there chosen camshaft, operating speed and  intended use.  There would be no point in preparing a head with steep race type valve angles and a larger port volume for a head which is using a cam that only lifts to say 10mm.  The cam would never see enough lift to use the extra airflow resulting in poor airspeed a slower car  and disappointment to the customer.  Unfortunately this is a common affair for some companies where all they can offer is a one head fits all application.

For racing and street performance see stage 2 and 3

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