Quote Originally Posted by SWGA Boater View Post
Look on your intake for the firing order. If it is a stock chevy manifold it will be stamped on the intake. Standard chevy engines are left turn. Firing order should be 18436572. My 97 outback is standard rotation, though it is a Mercruiser rather than PCM.
I meant to add... if the firing order you provided is correct, you do not have a standard rotation engine. You have a counter rotation or right turn engine.

If you have not broken the engine down, you can take the valve covers off and rotate the engine to see which order the valves are opening.