I bought these to ensure longevity when refurbishing the engine harness so I had the harness on a bench when I soldered them on. The wires and insulation were more robust on these than the OEM ones I cut off unlike cheap pigtails you buy that have undersized wires.. The colors did not match the OEM wire colors but it was not an issue. You could replace these without removing the engine harness but the amount of time you save by not removing the harness will likely be negated by having to work in the engine bay. Excellent, high quality, oem, completely satisfied. Don't forget to put your heat shrink in place before you start soldering!

Using to do quick check of uvch without removing the valve cover. Little pricy but works great. Time saver

Great quality Delphi / Alliant OEM connectors. RR's customer service is second to none! Thx

I've got a high mileage 7.3L and Clay's shop keeps me moving down the highway.

My truck has 411k miles on it and years of working on the engine and leaning on the harness has taken it's toll. My options were a new engine harness @ $600 or new VC Pigtails @ $35/piece.

Easy to install. Great quality as always from Allient and Riffraff.

Don't forget to check the internal VC harness too when your installing these just to cover your bases.

Picked this up to upgrade my aging gaskets and harnesses for my '95 PSD. No fitment issues. Great product.

These were a life saver. When my UVCH's became disconnected and I went to replace them the original wiring connecting to the valve cover gaskests were wasted on both sides. These allowed me to splice into the original harness instead of replacing the entire harness. They worked perfectly and I highly recommend these International OEM parts.

Fit as they should and had plenty of wire length for my conversion to SD gaskets on a OBS.