hamster427 Brain if you are building a motor with webers in mind, you don't want to run a carb camshaft. There will be too much reversion. With the right setup and carbs you can make 10-35 hp over a single carb motor. You didn't say what the max rpm or cubes of the motor would be?
A set of 48mm webers will get you to the 8,000 rpm range before falling. A carb will still make more power topend. This is on a small block ONLY. A 427 FE will run out of air in the 6,500 to 6,700 rpms with 48mm. Mid range torque is up about 20-30 ft of torque and hp about 10-35 hp. Another big thing is the exhaust on your car. It can cost you any where from 10-50 HP and torque You need back pressure in the 1-2.5 + pressure reading in your power band between max torque and HP.
Has far as webers on lemans car, Shelby went to single carb for the simple issues of less moving parts to have problems with and the bigger issue GAS MILEAGE. Every time you hit the pedal with Obergs or Webers the accellerator pump dumps gas into the motor, 4 pumps, 4 carbs that alot of fuel wasted. 1 carb, 1 or 2 pumps depending on the carb. Gas maileage did come into play back in the 60's. I beleive the the lemans cars where also limited to 6,500 rpms for the 24 hour race. I think they where allowed a higher rpm on the long straights.
Brain if you are looking for this kind of look, go with FI system and s setof TWM throttle bodies. They look like webers and run the same or better. The fi system also has a 10% adjustment for all different condition on weather. Webers are more for racing than street driving IMO. This is not saying that a setup of 58MM of Webers or Olbergs are not a work of beauty. When running right in a good FE motor, they sound great
Rick L. Ps I left out the price on the webers and TWM setup. I hope you have deep pockets.
