Finally the time has come to drop that new motor into your shell and make it go faster. After shopping for your engine, make sure that you have all the parts that you will need for you engine swap. Sometimes when buying your engine, the parts needed come as part of a package. Most drivers that I know usually swap out the parts that come with the engine with aftermarket parts that they buy separately.
When installing the engine make sure that the person doing the install knows what they are doing! You don’t want your engine falling out while you’re driving down the highway. The shop that I took my car to was located in Deer Park in Long Island. He specializes in Honda.
The process of swapping out your engine is very time consuming. First you have to drop out the old engine and everything that is associated with it, like the transmission, clutch, ECU etc. Next is put in the new motor. To begin you must connect the engine mounts. The engine mounts hold the engine in place. Next you must install the transmission. After that connect everything that you had previously disconnected like the power steering, radiator, radiator fan, clutch, exhaust system and etc. After all that, put you fluids back in and start that new engine up! For a more helpful guide that includes pictures check out How To Change A Car Engine.
When shopping for an engine, there is a lot you can choose. Based on personal experience, most people go for VTEC engines.
the performance engines like in the RSX Type S or the Civic Si, this is the one that i chose for my 2nd track car. The other is for economy engines found in the CR-V or Accord. The performance i-VTEC system is basically the same as the DOHC VTEC system of the B16A’s; both intake and exhaust have 3 cam lobes per cylinder. However the valvetrain has the added benefit of roller rockers and continuously variable intake cam timing. Performance i-VTEC is a combination of conventional DOHC VTEC with VTC.
When looking for engines it is very important to look for something that is not only compatible with your vehicle but is something that will last in the long run. Engines are very hard to shop for; there are several things that you must take into consideration. One that is the most important is the mileage on the engine. The more mileage on the car means the previous owner has beaten the engine and the wear and tear on the engine will be significant.
Most people go for K-Series engines. They have more power and is street legal. 
