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i am needing the year of the engine and The motor is in a 1987 V10 Silverado 4x4. As i thought 350 is 350 until I went to get the part. They had so many to choose from for both 350's and the truck it is in and each of them has different vacuum ratings and regulations for the emissions. I was advised not to pick and choose other wise the result of horrible gas mileage and performance loss would be a big factor. I am sick of seing that dang service engine soon light and it is tripping an 02 sensor lean code along with it. thanks for all the help.
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