Because a head gasket are not valve seals. What color of smoke is coming out of your tail pipe? if it's burnt oil, have your valve seals replaced. Head gaskets seal the space between block and the cylinder head. I don't know why your head gasket was replaced when a shop told you your valve seals need to be replaced...makes no sense.
SOURCE: 92 Camry with smoke and "shuttering"
Blue smoke means oil is being burned
do a compression check
SOURCE: 1993 TOYOTA TERCEL 1500cc Valve Seals Replaced now smokes much worse
You either have had the wrong valve seals installed, they are physically missing, or the valves are incorrect (too loose in the guides/stem too thin). The rocker arm seals will not contribute to your issue. If it did not have the oil smoke before you took the head off, the issue is with whatever the machine shop did. Valve seals have to fit TIGHT, or oil will go down the valve stem into the intake.
Take the head back to the machine shop & tell them to fix it. For free.
SOURCE: blown head gasket .... ran the car hot
sealers usually end up costing you more in the long term than the short term. these sealers react to heat and air. so you end up doing nothing more than plugging up you radiator, water passage ports, water pumps get damaged. causing more over heating problems than they solve. no i would go for what the shop gave you as a quote. that seems a pretty reasonable quote for the position you are in.
SOURCE: SMOKING REALY BAD
You need to replace your piston rings. Blow-by gases from the crankcase goes back with carryover oil to the combustion chamber through the PCV valve that's why you are burning oil and producing bluish smoke. Check if there's oil in the intake manifold.
SOURCE: My mitsubishi 98 montero sport is burning oil and
you need to install valve seals also have all your front seals and cam bore seals checked
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