Longer rods would not destroke the engine. Messing with the crank would, though.
Only changes to the crankshaft itself affect stroke.
That's be an awful way to add compression, by the way, since you'd have the cost of custom rods and then you'd have to worry about the piston smacking the head. Better to get flat top pistons - and for a KA24DE all you need is a set from an '89 KA24E. Cheap and they work.
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