for 1st generation engines with hydraulic tappets, single groove valves and cylindrical valve springs (until '97)

It is very important to verify the OEM spring type in your engine:

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The oldest ZETEC hydraulic tappet engine has cylindrical valve springs, which allow a maximum lift of only 9,0mm

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The newer ZETEC hydraulic tappet engine has tapered valve springs which allow a maximum lift of 11,0mm

engine with cylindrical valve springs: single spring [ref. 902-0015] can be used on OEM retainers, or on retainers [ref.99312]

engine with tapered valve springs: single spring [ref. 902-0015] can only be used on retainers [ref.99312]

This race camshaft was made for hydraulic Superproduction engines

ONLY for dirt track applications and pro street use with adjustable engine management or carburettors