Georgia200":1u3eys4i said:
Mill a large log head flat, removing as little material as possible.
Fabricate a 1/2in thick plate wide enough to accept the carb base.
Bolt the plate to the log.
Drill the plate to accept three of these: $85 on Amazon, $73 on ebay.
https://www.amazon.com/KIPA-Carburetor- ... 9&sr=8-159
your idea can be made to work, but you have some issues to overcome. the first is hood clearance. these are tall carbs to begin with, and that is before adding the air horns, and putting them atop a 1/2" thick spacer doesnt help. so be aware of that.
second, they can be made to work with a plenum, but the tuning is going to be a nightmare as you wont have consistent A/F control, though it will be more consistent than the stock one barrel.
third is going to be the issue of fuel stand off. this is where at certain rpm ranges fuel tends to collect in "clouds" just above the air horns. usually at low rpms due to the high velocity the carbs generate coupled with the sharp turns required due to the packaging the fuel "bounces" back through the carb and forms the afore mentioned cloud. and that cloud of fuel will cause havoc in getting the fuel mixtures right.
dont get me wrong, i love the weber style carbs, but they have issues you have to deal with.
for your application, here are three carbs i recommend instead, and using two instead of three carbs;
https://www.amazon.com/ALAVENTE-Carbure ... ljaz10cnVl
this is the venerable old 2100 autolite carb. solid and reliable and simple. it works well on a plenum style intake, and two of them would do wonders for the small six, and they are easy to tune, even with two of them on a log intake.
https://www.amazon.com/KIPA-Carburetor- ... ljaz10cnVl
this carb is similar to the 32/36 weber carb, and if you want three carbs, this would be the one i recommend, and the one i am considering for my falcon. these are progressive carbs so you get small barrels for normal day to day operation, but then open up the larger barrels for some real performance. again these work nicely on a plenum.
https://www.amazon.com/Carburetor-Roche ... 10&sr=8-13
this carb was put on millions of small block chevy and other GM engines. again it is a solid reliable and simple carb that just flat works, like the 2100 autolite. again easy to tune even with two of them, and they work well on a plenum intake. two of these would do the job nicely as well. and like the autolite carb, parts are readily available including rebuild kits for when that time comes. this one, like the second carb i recommended, is compact enough that it might just fit under the hood even with a 1/2" spacer.
