Thanks, guys. I'm anxious to see how this thing works, too. I expect with that big open plenum that low-end response from idle may be sluggish, but it should be OK at cruising speed and up. I remember seeing lots of log manifolds on flatheads back in '58 - '62 and some of them were apparently pretty good performers. At least this thing should get me running; if it's crappy I'll build another one later configured differently.