![]() Lots of questions? Thank you for your responses Is that something I could do myself? Also, who sells "kits" for distributors? Also, in regard to the distributor, years ago a friend with a period Sun distributor tester (I forgot about this) said the springs in the distributor were weak. Anyone know who makes the best kits? I had it out two days ago and revved it up, and then shut it off, and that seemed to help on the hot restarting issue. Of course this means I will have to remove the carburetor. The manuals label it as a "Ford" carburetor-does that mean Holly made it? Or does that mean Autolite made it ( what is the number on the Autolite)? Thank you for the input on the power valve, because of course it could leak right down into the engine when it was hot. I thought I saw the number 4160 in a generic Motor's Manual, but will check again. My carburetor matches exactly with what is in the service manual, though it could have easily been replaced. Maybe someone will comment who has more experience with your Holley. Maybe one of them is leaking? Sorry, that’s all I’ve got. From a diagram of the 4160 I saw on-line, it appears it has 2 power valves. On a cold start, the excess fuel vapors would have had time to dissipate. I think this would tend to cause flooding and hard starting when the engine is hot. If there is leakage, excessive fuel will drain into the carburetor Venturi and then into the intake. Power valves are designed to enrich the fuel mixture as vacuum falls during initial acceleration, then close as vacuum increases after a constant speed is achieved. My own 4100 carb once had a leaking power valve. Unfortunately, spark plugs are harder to read these days with ethanol blended fuel. Wet, fouled plugs could be caused by an excessively rich mixture. If the carburetor is the cause of your issue you might take a look at a couple of your spark plugs. But these sorts of things would not explain the hot starting issue. Noises could also be explained by a worn wheel bearing. Anything unusual there? Noises, excessively hot drum(s) after a cruise, etc. Gas mileage reduction could be caused by anything that increases drag. I have some knowledge of the 4100 through several “exercises” with the original one on my ‘61. I think this means your Holley may be original to you but was likely a replacement before your time. ![]() My understanding is that all the Bullet Birds were equipped with Autolite 4100 carburetors originally.
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