New CAT engines

Taller pistons and ported heads.
I wonder what the final compression ratio is loaded at high hp?
It has to be a scary number.
Remember, new pistons AND new rods, crankshaft and block castings around the crank.

Either a better engine or tighter grenade.

Think of what you call the original 1600hp engine.
Similar to many family trees of Cat's other engines, they were originally a tractor or off road equipment block usually making a few hundred reliable (life time) horse power.
The reliable torque and operating cost was desirable in these conditions.

Ah, But a marine engine. Well that 's take that 500HP engine out of that bulldozer and bolt on lots and lots of expensive parts that will make a boat go fast.
1000, 1200, 1400, 1600 HP after a few years.

So, That's a GREAT BIG jump in HP to get to 1552 HP originally designed for 4-500 hp.
Then the CAD/CAM to 2400 hp (block cast changes)