Here's a few pics of my latest twin engine that I'm building, based on a nrg motor. Two Doppler S7r barrels, Doppler full circle cranks, I'll be using Doppler s3r pipes running on std 17.5 carbs. Just waiting for some machining from an engineer and it's almost ready to build up. Just need a Mc3 to put it in! If you know where there is a good nrg for sale let me know.