Quote Originally Posted by The White Bubble
uhh.. Browntop ZC's drop right into a 84-87 civic/crx chassis. The Black top ZC is meant for a 88-91 Civic/CRX.

Also, another alternative is to find a 86-89 Integra motor.

Yeah, All Browntops have the Little PG6 pistons, but Take a 88-89 Integra motor with the bigger pistons, slap on the Browntop ZC head and you got it made. The Browntops Are identical to the 86-87 Integra motors Except the Head, this is where it makes its extra 15HP.

And bodydropped:
And Browntops are not the weakest either, they have bigger rods than all other D-series (PG6 rods), and make the same HP as the DOHC Blacktop ZC.

The Browntop is an Aggressive motor especially in a 84-87 Civic/CRX. And it bolts in too! My 84 HB i had with a Browntop was ALOT faster than my 88 Civic DX with Blacktop ZC.