I have a relatively stock hot air engine with stock pistons and Kenne Bell cam (1XTB) and I was told years ago that I should have btw 14-16 in hg vac at idle. I have for the longest time only get 11 in hg. I did a smoke test on the engine and the only place I could find a leak was at the TB throttle plate. I don't have a MAF since I use an aftermarket DFI system. I'm getting back into this engine again after years of the rebuild but it has always been this way. Any ideas on what I can check and if you think it is a problem with that low of vacuum? Thanks
paul
paul