wbute I dont think that you understand my situation here. I have a 253 V8 that I will be driving daily, and I want to make it as cheap to run as possible. SANM4N thanks for your advice. I also like the idea of dual fuel, I would most likely run it on gas more often than not, simply because it should be a bit cheaper. Power for me isn't too much of an issue. I'm not going to be driving it to go fast, I'll be driving it to get places. Can you make a dual fuel motor look like your van's motor? I'm only sixteen and have only been interested in old holdens for about 3 years, so I'm still pretty simple when it comes to the mechanical side of things. My rough plan is to ask the parents to pay for a gas system, and then eventually pay it off, so a new system could be a good way to go.