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Before modifying or selecting your next set of cylinder heads, take the time and match them to YOUR requirements and not just a maximum flow number, your engine regardless of brand uses a specific amount of CFM (cubic/feet/minute) for its CID (cubic/inch/ of displacement) at a target RPM. Big flow numbers generally mean a large cross sectional area which fitted to the wrong bore and stroke can lead to a poor intake signal and low VE (volumetric efficiency) the volume your cylinders can fill, if this percentage is down throttle response and the engines ability to recover itself after a gear change will suffer but still may record a reasonable dyno figure, no point in having a large dyno number if it takes a week to make it. Every Modified Engine or head and cam package at Shane Alex engines gets flow tested and ported in house to suit the customers individual needs.

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