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friend of mine was installing fuel pump in an mark 4 454 with after market cam, not sure of make. claims there was'nt any lift on the fuel pump lobe to work the pump.i never heard of this.are there cams out there without this lobe or is it possible it wore out some how. i never heard of either one. thanks for your thoughts kirk
 

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Yes,

If the cam he has is a GM Gen V or Gen VI Camshaft, they usually do not have a fuel pump cam lobe. It should be a Hydraulic Roller Cam. Some early Gen V's had the lobe.

Does the cam have a stepped nose?
 
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