hey guys, i need some advice on what might be the problem with my 71 240. at the moment it has an l26 with roundtop su carbs, which seem to have been cursed. I got the car in august and it ran fine up until about october, when we had a problem with the choke sticking on the rear carb. we fixed that, and the car ran fine for a week and a half, until it gradually seemed to be losing power, but was still driveable. it got to the point that one day it just had no power whatsoever and had a nasty backfire out the carbs. it was acting as if the front carb was doing all the work, and the rear was just sucking air. so, we began checking out the problem, but we really havent made much progress...
we did a compression test on the engine, and it showed 80psi across the board, which seems low.. but it was consistant so i dont think theres a problem with the actual block. the carbs were our first suspect since theyre 35 years old, so they got sent to Whiteheads in Toronto, where they were rebuilt because the needles and seats were worn right out. so, we got them back and on the car, but theres still no change in how the car runs. the carbs should be fine, they were flowtested and everything, but they havent made a difference. so does anyone have any ideas what might be the problem? the next thing we'll check out is the vacuum advance on the dizzy, if that is stuck/inoperable could that cause the problem?
Any help with this is greatly appreciated, this is my first time actually working with a twin carb setup, so i feel like im just taking shots in the dark
-Rob