A good carb is hard to find. If you find one, keep it.
We tested several custom carbs last week on the dyno and they all sucked. We have a box stock Holley Gen 3 Dominator that just flat out works. It consistently runs better and makes more power than any of the "tuner" carbs that customers bring in. I don't have any explanation for it, just the way it goes.
Everyone keeps buying the Thumper carbs I get, and then I have to order another. Its like telling people isn't always enough...Show them the plugs after a day at the track and the performance you got out if it, and man they offer up the money....
His carbs respond to the smallest changes. You can dial them right to the edge....There are very few people I would order a 4500 carb from and feel comfortable that when I got it, it would be close enough for an idiot like me to tune it with a little over the phone help.
