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Calibration ChipsEdelbrock EFI Systems are shipped without the calibration chip that is necessary to operate the ECU. If the cam is any brand other than Edelbrock, check with manufacturer for compatibility with EFI (lobe separation angle must be at least 112° or cam must maintain at least 10" of manifold vacuum @1000 rpm). Then, fill out the camshaft specs on the provided postage-paid card and Edelbrock will send you the appropriate chip, free of charge, via second day air (U.S. only). The chip installs into the system computer in minutes. Additional chips are available for a nominal charge if you decide to change your cam. Edelbrock has chips for most cam profiles. Call the Edelbrock toll-free tech line for details...1-800-416-8628 or by e-mail: efitech@edelbrock.com