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17 This is a B&M small-block C6 automatic designed for 351W and 351C engines. Although it will bolt up to any 289/302/351Wci engine with a six-bolt bellhousing, this is not the transmission you want because it is too heavy and inefficient for a small-block. Where the C6 differs from the C4 is its one-piece design with the bellhousing and main case cast together. There are four C6 bellhousing bolt patterns: six-bolt small-block, round FE bolt pattern, 385-series and 351/400M pattern, and the diesel bolt pattern, which is identical to 385/M-series except for torque converter opening at six o'clock with a dust cover.