Where do you smell it?
In the cab(heater core)
At the exhaust pipe(head gasket)
In the engine compartment
Best bet is to warm up the engine so cooling system has some pressure in it then shut off engine, open hood, listen and watch.
Also squeeze the hoses and look at all hose ends, after engine work and re-clamping the hoses can crack.
Also check overflow hose for leaks.
Valve covers shouldn't leak at all but especially after being replaced, lol.
Make sure valve covers didn't get over torqued, the stamped steel covers will warp and leak oil, there is no "oil pressure" in the valve cover area, it's just gravity and a hole where gasket isn't tight that allows a leak.
The intake manifold has a good size gap front and back in the valley, you need to put silicone(which comes in the gasket kit) on those seals to prevent oil leaks.
Last edited by RonD; 01-21-2014 at 04:19 PM.