To replace the headgasket you'll need to remove the head and take it to a machine shop. A headgasket fails when the head warps, removing pressure from portions of the gasket. the new headgasket will not last if you don't have a machine shop shave the head to make it perfectly flat.
Removing the head is a little involved; you need to remove the front cover/oil pump assembly (all in one) to remove the head. It's easier to just pull the engine.
What is the firing order on a 1993 saturn sl2 twin cam?
No
No.
It isn't. You've been misinformed.
Fron the engine bay
How do I replace the water pump in my 1994 Saturn SL2 series standard twin cam.
See saturnfans.com
usually but not always
Twin Rivers Primary School was created in 1993.
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Inside the fuel tank.
5W30