Yes, you can put a small block V8 in there, because it is no longer than a 4 cylinder inline engine.
But it would be hard to mate to the transmission, so would be easier to swap transmissions as well then.
But a lot easier is to just go with a more powerful Toyota Tacoma engine.
You have the: 2.7 L 2TR-FE I4 (159 hp)
But you could easily put in the: 4.0 L 1GR-FE V6 (236 hp)
Or you could investigate one of the supercharged or turbo charged options, even though it is a lot of work to retro fit either.
Toyota Racing Development offers a TRD supercharger for the FJ Cruiser and Tacoma equipped with 4.0-liter V6 engine, available through Toyota dealerships.
The 2RZ-FE and 3RZ-FE both have a supercharger available through TRD (Toyota Racing Development). The supercharger is manufactured by Alpine Developments and are available from LCEngineering.com. This kit is rated at an increase of 50% power at 8 psi of boost. The most commonly seen is the TRD supercharger available for the 5VZ-FE V6, which is manufactured by Magnuson Products. This particular supercharger is rated to increase power from 190 hp (140 kW) to 251 hp (187 kW).
The 2005 - 2008 4.0-litre (1GR-FE) engine also has a supercharger available from URD (Underdog Racing Development). It increases the RWHP from 209 to 425. That's 236 horsepower (176 kW) to approximately 470 horsepower (350 kW).
Adding supercharging or turbo charging to an engine not designed for it, requires reducing compression ratio, usually with thicker head gaskets.
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