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GM used different compressors throughout the shark years. This is an A6 unit that was used until early 77 and then replaced with the R-4 unit, which was used through 82. The A6 unit is more durable, but it does have some problems. The low side hose is located right above the exhaust manifold, and the fact that its almost 30-year-old technology means well be replacing it with a Sanden unit that Chris offers in his kit.