Looking at a new dizzy for my rebuild. One from SimonBBC looks good, and affordable. Planning on a 9.35:1 CR 3.9L engine, with an SD1 front cover, so late drive gear will work. Most LR engines down here come with 8.13:1 CR, and I dont have its original dizzy anyway. I asked Simon about advance differences between different CR engines, and he just said it will work, dont worry - 35dlm8 . Do his units have any heat problems with the amplifier fitted to the dizzy body, like they did on RR in the past? Anybody with experience in th area can comment please? Hammil says a 3.9 should be good with a total advance of 34d, probably starting from a static 10d, assuming decent fuel rating.