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This is essential in all engines with gas flowed ports whether aluminium or iron, and engines converted to lead-free fuel. Precision turned with honed bores this should not require reaming after fitment. Colisbro material being of a copper colour should not be confused with the inferior yellow brass coloured cheaper alternatives.
Welcome to the Denis Welch Motorsport website for Performance Parts. We cater for every aspect of work on your classic car be it road, race or rally, using our unrivalled success in many aspects of Motorsport to make your car as successful and reliable as possible.×
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