If my memory serves me.....
gen I's have a cylinder liner that is 'loose fit' - gen-IIs is machined interference fit.
gen-II's blocks are lighter - I think
Since the heads aren't interchangeable - there must be oiling or water
passage differences - or differences in front machining to accommodate accessories because the alternators have different locations.
They are different as noted above the gen 1 is about 80 lbs heavier. You can tell an early gen 1 block by looking for a snowflake on the right side of the engine. The main way to tell the difference between the 2 engines is that the main caps are cross bolted on a gen 2. You can see the bolt heads for the main caps along the sides of the engine block. I would stick with a gen 2 engine they are stronger.
They are different as noted above the gen 1 is about 80 lbs heavier. You can tell an early gen 1 block by looking for a snowflake on the right side of the engine. The main way to tell the difference between the 2 engines is that the main caps are cross bolted on a gen 2. You can see the bolt heads for the main caps along the sides of the engine block. I would stick with a gen 2 engine they are stronger.
Just my .02 cents
The best way to visually check for a Gen 1 engine is to look for traces of antifreeze leaking.
The gen 2 has cross bolted mains which help the bottom ends strength. Also the manufacturing process that was used gave the metal in the block a greater tensile strength. This is second hand knowlege so it may not be totaly correct but it was what an engineer told me. It may be possible to give the gen 1 more strength by having cross bloted mains. It would take some major machine work to do this however.
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