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Discussion Starter #1
I have a 1967 327 in a Model A Ford, manual transmission, Holley 4 bbl manual secondaries, Pertronix module in stock distributor, dual exhaust with headers, stock engine the rest of the way.

I am coming back from a car show and I stop the car at a red light. When I try to accelerate, the whole engine just bogged down with little back fires in the carburetor. I had to give it gas very slowly to get back up to speed. The car runs great at idle, and at full speed but gives trouble when accelerating. At the same time this happened I started seeing a lot of white smoke coming out of the tail pipes. I have dual exhaust with headers, and there is an equal amount of smoke coming from each pipe. Even when car is idling I get a lot of white smoke. The car never emitted any type of colored smoke at all before. All this happened suddenly. I had no problems before this.

I pulled the plugs and they all have a black soot over the ends which is weird because I never had black smoke before. The accelerator pump is good, fuel level in bowl good, all adjustments on carb to factory spec. Checked for vacuum leaks, found none. I have driven the car 20 miles since the problem first happened. Oil, and water both look normal with no loss.

Anyone have an idea as to why I am getting all this white smoke, and the car is having trouble on acceleration only?? Any ideas will be appreciated. Thanks.
 

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Discussion Starter #2
The antifreeze question

I had thought antifreeze might be getting into the cylinders myself, but if that were happening, wouldn't I have a low fluid level in the radiator after driving 20 miles? When I removed the cap the fluid was right up to the top. That was a good idea about checking for the clean plugs. I will do that tomorrow.
 

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More tests but still stumped

I have done a few more checks and still have found nothing wrong but some dirty plugs. All the plugs looked the same. Compression test, plug wire resistance, fuel pump, carb, checked the gas itself. I will pressure test the cooling system to see if fluid ends up in the cylinders next.
 

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Discussion Starter #4
bad gas

Thought I would let everyone know, it turned out the problem was caused by bad gas. I removed some of the gas from the car and put it in my lawnmower. The mower had all the same symptoms as the car. I pumped all the gas out of the car and replaced it with new gas and it runs like a new car again.
 
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