5.3 help smoking

[Bsn92485]

OK I have a 2000 Silverado 5.3 with a Paxton supercharger 2 weeks ago it started missing on all cylinders and white smoke coming out of oil cap and exhaust.so I changed the spark plugs and 02 sensors and still doing it. It dies use oil and it dies run a little rich at an idle. I'm lost I want to say is the piston rings but what would make all cylinders misfire

[Bsn92485]

Any ideas what it could be

[anumber1]

Pull the plugs.

 

Read the plugs.

 

Test compression.

 

Smoking out the oil fill cap doesn't bode well for the health of the motor...

[j-ten-ner]

Head gasket.

 

so long

j-ten-ner

[Bsn92485]

You think head gasket or rings and if it was one of those why would it misfire on all cylinders I could see if it was one side. I did pull the spark plugs they looked normal besides one was a little dark

[Dnt]

Pressure Test the cooling system most likely it has blown a head gasket. How long have you been running the supercharger?

[Bsn92485]

It's never been low on coolent just oil. It's been on there there about 6 months.