383 Cruising Issue

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7milesout said:
I also meant to add a couple things: Your car looks awesome with those wheels. Helpful or not.

I hope my post above was helpful. Another thing besides the k-thunk noise that makes me believe it is / was running lean is that you said, "if I try to push it." In my mind that means you're trying to accelerate to go even faster … which will use more fuel and run the float down more. Yeah, sure it should handle it. But sustained periods of 4,000 rpm uses a lot of fuel. Using a lot of fuel creates heat. Both could lead to just enough vapor lock to not allow the bowl to be full enough.

My Scamp turns pretty much 3,000 rpm at 60 mph with 24" tires, 3.23 gears and a TrueTrac. To be accurate, the tachometer shows right at 3,000 rpm. But my tach sort of freezes when I accelerate hard. Cruising along it doesn't freeze, but the freezing tends to make me believe it's not so accurate. So another tach will be sourced next year. RPM tools on the internets says that my combo should be turning 2,713 - 2,786 rpm. But it sounds like its really screaming. I can't even imagine 4,000 rpm.
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My dad mainly suspected it was running lean. He already rebuilt the carb replacing jets and whatnot, so I'm thinking it might be more in the delivery from the tank. But yeah, we still have yet to check the accuracy of the tach.
 
Good luck on your search. One little thing that hasn't been brought up is the possibility of an overheating coil. There is no test for this, they will look fine, but when warmed up will spark erratically or completely fail until cooled off. Just replace with another and try it.
 
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