https://www.honda-acura.net/forums/s...d.php?t=203947

Moved. That link explains why. :a:

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Why in God's name would you want to toss a larger-displacement DOHC four for a SOHC mill? :eh: Even if the factory motor is dying, I'd replace it with another B18A.

*B16A*: 160hp, but 110 lbft @ 5600±. No goddamn torque. Any transmission worth using with that motor will drive you batty, unless you want to live at 5000 rpm on a daily basis.

*D16Z*: Again, why bother? Same factory rating as the B18A, but with a weaker low-end.
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And in terms of general smog legality:
You can install an OBD-1 or OBD-2 motor in a pre-OBD car without issue, provided you keep all of the factory emissions equipment for the newer engine installed and functional. This is where the expense comes in.

In short: Make life easy on yourself. If your original B18A is knackered, rebuild it or replace it in kind. Downgrading to a VTEC D-series buys you nothing.