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Factory Five Roadster Engine And Tranmission Engine Level

The optional FFR 4-into-4 headers do not have provisions for oxygen sensors if you are planning to use them with fuel injection (as we are). So, we had to drill holes into the headers (one on each side of the engine) following the Mass-Flo EFI instructions to weld the supplied fittings into place.
Factory Five Roadster Build Part 9: Engine And Transmission Install

The optional FFR 4-into-4 headers do not have provisions for oxygen sensors if you are planning to use them with fuel injection (as we are). So, we had to drill holes into the headers (one on each side of the engine) following the Mass-Flo EFI instructions to weld the supplied fittings into place.  View Related Article

 

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