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

I found some crank casting numbers today.
153 '62-'02 (must include marine engines) These all have 2 piece rear seals, 2.0" rod pins, and 3.25" stroke. # 3788522, #3793082, #5743014
181 '60-'99 2 piece rear seal, 2.1" rod pin, and 3.60" stroke. #N393775N, #N9341352
181 '60-'99 1 piece rear seal, 2.1" rod pin, 3.60" stroke, uses 1"wide rod. #140966
181 "00-'08 1 piece rear seal, 2.1" rod pin, 3.60" stroke, uses .940 wide rod has a torque converter hole. (?) #93436083
181 "00-"08 1 piece rear seal, 2.1" rod pin, 3.60" stroke, uses .940 wide rod has no torque converter hole. (?) #93436083

The .940 rod width of the last two cranks seems the mean that they could be used with SBC rods that has the 2.1 bore. The ones with 1 piece rear seal could be used in a 151. That would add .60" to stroke. Which makes the Iron Duke a 181.