HYDRAULIC ROLLER-Noticeable idle, requires modified HYD HYD 112-501-11 XFI268H13 268 272 216 220 .528 .531 113°computer, strong midrange.Electronic Fuel Injected engines have very different camshaft requirements from those of carburetedengines, which require a strong signal at the carb booster to draw the correct fuel mixture into thecombustion chamber. Since that excess flow is not required with EFI engines, camshaft lobe profilescan be manipulated for increased performance.The new XFI™ camshafts feature wider lobe separation for decreased overlap, yielding a more efficientcombustion process.The XFI™ lobe profiles were designed to work in conjunction with recent valve traintechnology advancements, including COMP’s Super Clean™ Beehive™ valve springs and increased ratio ProMagnum™ rocker arms, thus delivering faster valve openings and closings while maintaining complete valvetrain control. Additionally, the XFI™ camshafts take advantage of the high velocity EFI-style cylinder headintake ports, intake manifolds and combustion chamber designs.The result: dramatic improvement in performanceand durability for today’s fuel injected engines.

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