I have two freshly rebuilt stromberg 48's on a supercharged Ford Flatty. The motor won't stay running. It runs off of the fuel I prime it with. It then peters out. If I get a good rev out of it. It backfires out the blow off port. Not good. That indicates a lean or no fuel issue. I lifted the top of one it was full of fuel. Using a electric pump. Do I have to modify the carbs to work with the blower??
As noted, yes. All of the fuel feed passages may need a slight enlargement. I'm sure this info is somewhere on the WEB. The backfire could also mean ignition timing problems. Mike
Running 48’s on my blown flathead. 51 main jets, 60 power valves, straight linkage, 3 lbs pressure. Carbs calibrated with old Penske exhaust gas analyzer. Harmon Collins dual point, calibrated on Sun Machine, advance set using vacuum gauge. NGK b6l plugs, .030 gap. Blower 5-6 lbs boost. Runs great with over 15,000 miles on engine with no issues.
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