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[djhorner]

limped home today with smoke belching out exhaust and sounding very rough found out rocker cover gaskets had gone and where spark plug is was full of oil any ideas if this could of caused the very smokey exhaust

[Gaffers]

oil in the plug wells will cause a misfire, the misfire is sending unburnt fuel in to your hot exhaust creating smoke.

You need to change the rocker cover gaskets, use genuine GM as pattern dont last more than a few months and make sure you clean the breathers.  The latter bing the cause of the blown rocker gaskets

[djhorner]

changed all gaskets cleaned everything but still smokey and sounding like its not running on all cylinders i think head gasket has gone

[dbug]

changed all gaskets cleaned everything but still smokey and sounding like its not running on all cylinders i think head gasket has gone

Doubt it mate

Will be smoky for a while if oil leaked onto exhaust.

Misfire could well be goosed HT leads if pre f/l or goosed coil pack if f/l due to being cooked in oil

[Gaffers]

HG failure quite rare on these cars and it's usually due to abuse of the cooling system with 100% water rather than coolant/water mix.  As sail it's likely to be the HT leads/coil pack due to the oil cooking them.

[djhorner]

there is a coolant leak and white smoke out of exhaust and i have changed hbv

[dbug]

May be worth pressure testing cooling system to locate leak - obviously it wasn't the hbv in this case 

White smoke from exhaust is common on V6s this time of the year.

What year is your car - 1998??

[djhorner]

yeah its a 98 mv6 3.0