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There are many types of carburetor spacers on the market. This month we test four popular styles and see if they really improve power. The engine we’re using for our test is a fairly stock 383 with a Comp flat-tappet camshaft and Edelbrock Victor 383 intake manifold. This basic combination is typical of many big-blocks in our readers’ Mopars, and will serve as a good test of carburetor spacers.