Bad fuel air mix. Throttle body out of ajustment or injector damaged during reinstall or computer getting wrong info. Or they did not machine the heads before they put them in.
cracked heads, water and oil are mixing
you may have a blown head gasket. if you keep driving on a car with A BLOWN HEAD GASKET it may permanently damage your engine (especially if you have aluminum heads-they'll worp). if the heads are shot, it's all over. you need to take it to a shop and have it looked at. if that is the problem and they can replace the gaskets without damage to the heads, it won't be cheap. it's a tough job.
Steam from the tailpipe, and water in the oil means you have a faulty head gasket. Not a good thing. The steam is the antifreeze/water coolant leaking into the heads (bad gasket) getting heated by the engine and coming out as steam. The water in the oil is the same deal, but it;s collecting in the oil so it isn't coming out of the tailpipe. You need a new head gasket. I promise.
They can if the heads are cracked ,are the intake manifold gaskets were put on wrong when thay were installed. The heads themselves if thay are good heads will not cause overheating. You cannot put the head gaskets on wrong on a small block Chevy engine.
The heads don't necessarily need to be resurfaced when you change the head gaskets unless you think they may be cracked. They should be resurfaced every time the gaskets are changed, but you can get by without resurfacing them.
Not on the head gaskets.
you will probably need to change heads gaskets
Sandwiched between the heads and the engine block.
could be a faulty thermostat don't over heat it to often you'll end up blowing your heads gaskets drive safe
The 283 has a larger bore diameter, so use the 283 head gaskets.
Thick white smoke is an indication of coolant entering the combustion chamber. More than likely you have a blown head gasket, especially if the engine has overheated recently. Stop driving this car as severe engine damage will occur due to coolant in the oil. The heads must be removed and new head gaskets installed. A major repair.
From 1996 to late 1999 There was a problem with the intake gasket design on the Vortec engines. They have sents redesigned the gasket and now it does not leak as often. Intake Gaskets leaking is a common problem. Now the only time you have a problem with the heads is when the engine is over heated, and I mean HOT. Then the heads warp and the head gaskets leak or blow. Chevy just don't have problems with the heads on the V6 and V8 engines.