SoCal Racer #13
What parts are needed to convert an RSR 7.5 A/C to a 4.2. Do I have to buy a whole new engine and exhaust? By looking at the part numbers; the 7.5 is a series II and the 4.2 is a series I. Is this the reason a whole new engine is needed? The cost for a new one with exhaust is pushing $900, yikes. I was hoping I can just swap engine parts and exhaust.