what causes white smoke from exhaust?

Fuel nor oil smoke is white. Never has been, never will be.

Oil smoke is blue to purple-ish blue

Fuel smoke is gray to black

Water smoke is white

ATF (auto trans fluid) smoke is white.

Condensation is very norm and a good thing. The better the ring seal is the more condensation it will have, also the weather cond. will effect amount of condensation

The diff with condensation and smoke is the condensation will come out of pipes in large amounts and just kinda vanish. Smoke will hang around and flow through air with the breeze

If it is white smoke, then thats water/coolant getting into the chambers via blown/leaking head gasket, cracked head or cracked block

Or if the auto transmission vac. modulator valve blows, it will let ATF (auto trans fluid be sucked into intake by the vac hose from mod valve to engine, this will get in the chambers and smoke like crazy out the pipes and it will be white

As far your rich fuel smell to exhaust, your carb just aint adjusted right.

It could be too much fuel pressure, floats set to high, choke staying on or not opening all the way, idle air mixture screws adjusted wrong, or way too big of jets in carb for your engine combo.

You didnt list what carb you have on the engine, so I can't give you detailed tuning info. Gen stuff though is

Fuel pressure at 5 to 5.5 psi

Adjust idle air mixture screws using a vac gauge and low rpm tach. Set screws to give highest vac readings then turn them in to lower rpm 50 RPM at idle. This will put you at whats know as "lean best idle"

If it doesn't go away when the engine is fully warmed up, it must be coolant, probably due to a leaky head gasket. But the exhaust shouldn't smell like gas so that part is baffling. A cold engine that is carbureted would produce white smoke from condensation and because carbs are not precise, unburned gas as well while the choke is partly closed. Warm it up for 20-30 minutes and check it again.

There are two sources of white vapour coming out the tailpipe: -- Water vapour (normal -- goes away after warmup) -- Coolant (not normal-- doesn't go away) If you have continuous white smoke, I'd suspect the head gasket is toast. HTH V

if you smell gas and get very poor economy, then its a fuel leak. it can be a blown power valve on a holley if you have one, or any number of other fuel leaks on a carburetor. once it gets warm enough the smoke should go from white to black.

get you a can of sea foum read the can before doing this.but put a little in your intake holes and the rest in your oil. but a can of SEA FOUM will stop it also make your car run better

it is possible it could be fuel, and fuel can be whitish this means fuel is trickling down for some reason, please check the oil and sniff it too, make sure it does not smell like fuel. Its hard to say what is causing the excess fuel, keep track of the gas mileage just to see if it is affecting that overall. Lets hope the oil does not smell like fuel.

am sorry i meant to say vacuum holes not intake