47 Ford Flathead V8 surging in gear

[Squadron]

Hey folks,

I think I finally licked all of the cooling issues for my flathead v8 in the old ford. I took her out for a drive and noticed a couple of things though:

When I am accelerating it feels like the car is "surging" in gear. As I rev a little higher it evens out, but I feel like I've gotta keep the revs pretty high or I lose power.

Any thoughts? Could this be a fuel pump thing? Timing issue?

When I let the car idle, or I rev the engine without being in gear I can't hear any misfires or anything. It just ticks along.

[Kelly Burns]

Could it be the clutch slipping?

[Drbrown]

Worth considering Kelly's clutch thought. I doubt it's related to the ignition system (plugs, wires or distributor) as it would show at high as well as lower PPM's. A fuel pump malfunction or gas contamination would tend to show itself at most and upper RPM's. So if it evens-out at high RPM likely something in the carburetor.

[RKS.PA]

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When you say, "surging" do you mean you actually pick up speed, or do you mean the engine revs higher, but no increase in speed?