hitachi carb 2 barrel- can u swap a 1986 with a 1981 without a mod?. the only real difference that i can see is that the 86 has 2 diaphragm things in the back were the 1981 has only 1.

Both EA81 engines? If so i would say yes. The EA82 carb is bigger and will not bolt up to an EA81, EA71 manifold.

yep- its the EA81

That diaphram on the back is for the choke. So as long as the choke works, don't worry about the second one that you will have. You may also have a feedback carb(86). It has air line connections on the sides of the carb leading to the emulsion tubes. One is above the two vacuum connections for the EGR and Distributor, the other is just opposite on the flip side. Cap them.

sweet!

I just looked at mine and the ports for the feedback lines are the 90 degree ones, one front, one back. Just cap them and your good.