Reason I asked about the 86mm 1AZ is because 86mm is quite a good stroke for torque also.
2.1 litres is a nice capacity too for a vf34 or disco potato. However the 2.4 sounds like
a perfect NA setup also for the street with beefy mass on its performance curve.
Ive read about a Guru on 300hp B16 NA setups that he find 1.543 rod stroke ratio still
a good compromise. It supposedly allows more compression by having the piston move away
faster at the top, improving suck/swirl/mix less detonation as it moves fast away from flame front.
The force of angularity on walls is minimised with todays lighter pistons that are friction coated
and thinner rings then piston life is increased as they spend critically less time or combustion forces.
Suzuki used the same principal in its infamous G13B road engine compared to its bike engines.
Honda has been doing it since the EB1 a magical little engine with what the FC20 has now.
The all alloy gen 1 honda civic EB1 engine had a ladder brace, 300g steel rods, small bore
long stroke & high rpm plus other features almost 40 years ago etc.
If the Ae86 becomes available Id prefer the AZ over the heavier, less flowing subey Boxer.