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most blocks come shipped without the adapters, when I purchased my crate engine, it needed the adapter as well, which I purchased from GM for about $20. My old 350 also had an oil cooler on it from the factory, but I bypassed it (very easily) just for simplification and a "cleaner" engine bay. GM hasn't really changed the design of the SBC until recently, with the LS1 found in Corvettes, Trans Ams and Camaros. The basic design of the SBC is the same from its introduction in the late 1950's clear up until a few years ago with the debut of the LS1. In 1986, GM changed the blocks slightly, changing the crankshaft design, and putting roller lifters in the blocks.
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