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There are alot of different motor swaps for these cars. Before you choose which one you have to think of 2 things, your skills and your money. Skill wise it goes D to B to H to K to J. The last time I wrote this there were 3 main types, The D, B, and H series. Now K is the new B and J's are making their way into the scene due to mount kits being made available by companies like Hasport. D-Series The D-series swap is the easiest and cheapest swap in a 4g Civic. They bolt right in and their cheap. There's no need for new axles or mounts but if you don't have an Si a DPFI to MPFI swap is needed unless you keep your stock intake manifold and distributor. It is a very popular swap to put a Z6 or Y8 Vtec head on a D15 or D16 block. Your car had a d series from the factory so you can use all of your stock components. The L3 tranny out of the 4g Si or off the DOHC ZC are what your going to want to use. B-Series B-series motors are probably the most popular. Go in pretty easy and their not a slow motor stock. The cable tranys available are S1, A1, Y1, and the YS1. The Y1 is optional LSD and the YS1 is LSD. The S1 and A1 are out of 90-91 Integras, the Y1 is the JDM B16 tranny, and the YS1 is a GsR tranny. You'll need motor mounts. Hasport is definately the best but there are other companies one being HCP. Then your going to need shift linkage. There is adjustable linkage available through Hasport. There is also a company named Avid or you can shorthen 90-93 Integra linkage. The stock throttle cable doesn't work so you'll need it off of a 90-93 Integra. The axles from a 90-93 Integra or custom axles must be used. Dx or Si hubs need to be used. The dust rings also need to be taken off of the knuckles. Also a 90-93 Integra intermediate shaft needs to be sourced to go along with the axles. A large dent must be made in the frame rail, right below the strut tower, for alternator clearance. Last the stock exhaust manifold won't match up. You can either get a cat with adjustable flange, get a custom exhaust, or use your d series downpipe with the b series cast manifold.Vtec needs to be wired in if using a vtec motor.
H-series motors require alot of work to get them in and almost require an upgraded suspension because of the increase in weight. This is a pretty expensive swap and definately the most complicated of the b, d, and h series. And in my opinion a waste of time. It throws off the geometry of the car due to the extra weight and the mounts and axles are stupid expensive.
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