yes. A gasifier uses heat to expel flammable gasses from wood that is powerful enough to run a standard engine after modified.
no real mods to the engine other than adding a woodgas/air mixing valve. modern engines even take care of spark advance for you. I'll be setting it up dual fuel so it will still run gas if i want it too and will be able to switch on the fly.
here's a link to my small gasser if anyone is interested