B20a5 Vs B20b

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88 C1V1C 53D4N DR1V3R
what are the main differences between the old prelude motor and the newer crv motrs? do they have a similar bolt pattern or are they completely differnet? i want to know if you can bolt either one into a 5th gen civic. does anyone know? :eek:


Senior Member
old prelude motor is worthless in anything but that car.. the crv will bolt in, need a mount kit.

No, nothing is interchangeable.


i wouldn't say nothing. you can swap the crank :)

but other than that, yeah the b20a/b21a prelude motors REALLY aren't a b-series even though they are