has anyone ever heard of someone putting a b20a5's throttle body, plenum, and intake manifold on a b18c1?

 

No, probably because the B20A5 out of the preludes isn't really considered a "B" series like the rest of the civic/interga engines. The heads aren't interchangeable, neither are transmissions, mounts wouldn't line up, etc...It's not really the B engine you're used to.

Did you really think the intake manifold from a 135hp engine on a 170/180hp engine would be good?

 

at the time i didnt know anything about the preludes motor. ive really only looked at civic and integra motors. i was in a junkyard with a friend and happened to see it. all i knew when i was there was that the displacement was bigger. when i got home i found out it was a lot weaker and everything else. good thing i didnt just buy it.