What carbs?? and what jetting?? Have you tried a different stat or no stat. what shape is the rad in. I once had what I thought was a good rad and it would over heat re cored it and world of difference. Lean will make it run hot as heck. TRW/Sealed power/Speed pro Power forged pistons with less than .005 clearance will run hot and be hard to start?? Have you checked for a rad hose collapsing?? timing is right?? good fan and shroud???
