Inliners International Forums General Discussion Engines GM 4 cylinders 151 153 181

The 153 is 3.875 X 3.25 and the 181 is 4.0 X 3.60. Do they both use the same main bearings? Can the 153 be bored .060 like the 6s. Can the use small block rods or is there a width issue like with the 6s? Beater