Me and a buddy are putting my thunder cam in my car. My buddy was telling me that I'm gonna need to get an air compressor to keep the push rods from falling through. I'm just wondering how big of an air tank will i need to keep pressure in the clinders?

 

Your buddy is thinking of keeping the valves up with compressed air while you are changing the valvesprings. You are going to need quite a bit of air to do all the cylinders. I have never used a portable tank before, but I think the smaller kind would run out of air pretty quickly. You really don't need alot of PSI though, so it might last long enough.