On all of the High mileage Injectors that I pulled from the Junk Yard and also on my own car; the area that the Injector Heat Shield does not cover was eroded away.

This could mean that if you have the Large Hole Injector Shields already on your car and the exposed area of the Nozzle is eroded away that you cannot use the Small Holed Injector Shields because they would not seal over the eroded metal.

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84 300D, 82 Volvo 244Gl Diesel