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Will a 700r4 bolt to gm 400?

No, a 700R4 transmission will not directly bolt to a GM 400 small-block engine. The bolt pattern on the 700R4's bellhousing is designed for the GM small-block (e.g., 305, 350, etc.) The GM 400 uses a different bellhousing bolt pattern. You'll need an adapter plate to make them work together.