"Small Block: The smaller of a manufacturers two series of engines. In the case of Chevy, the small block includes the 262, 265, 267, 283, 302, 305, 307, 327, 350, and 400.Big Block: The larger of a manufacturers two series of engines. In the case of Chevy, the 366, 396, 402, 427, and 454.
Mopar, with: A and LA (small block) engines: 273, 318, 340, 360; B (big block) engines: 350, 383, 400; and RB (bigger block) engines: 413, 426, 440.
the 302, 351W, 351C, 351M, the always forgotten Ford 400 (the missing link).A 302 and 351W are small blocks. But also note that a 302 and a 351W are different blocks due to the 351W's taller deck height. Now the 351C,351M, and Ford 400 are all actually the same block except that the 351M/400 have larger crank journals, also they are all big blocks. The cleveland came first, then Ford wanted to use the block in trucks and passengers cars so the stroked it to 400 and changed the mains and ditched 4V heads. All this to make more torque at lower rpm's more suitable for a car/van/truck. Once the gas crunch hit they destroked the 400 back to 351. It was a modified 400 hence the name 351M."
Mopar, with: A and LA (small block) engines: 273, 318, 340, 360; B (big block) engines: 350, 383, 400; and RB (bigger block) engines: 413, 426, 440.
the 302, 351W, 351C, 351M, the always forgotten Ford 400 (the missing link).A 302 and 351W are small blocks. But also note that a 302 and a 351W are different blocks due to the 351W's taller deck height. Now the 351C,351M, and Ford 400 are all actually the same block except that the 351M/400 have larger crank journals, also they are all big blocks. The cleveland came first, then Ford wanted to use the block in trucks and passengers cars so the stroked it to 400 and changed the mains and ditched 4V heads. All this to make more torque at lower rpm's more suitable for a car/van/truck. Once the gas crunch hit they destroked the 400 back to 351. It was a modified 400 hence the name 351M."
