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You might be right as this is a common error during a rebuild (at least from the people on this forum). There are several ways you could check this. One way would be to pull the 1 and 4 plugs and turn the engine over by hand. When turning the crank on the compression stroke of 1 or 4 check that air blows out the hole on one of them but not both. They should alternate every 360 degrees. You could also bull the intake valve covers and see that the intake valves open 360 degrees apart. Cam timing can be done in the car. I'm not sure it would be easier than pulling the engine to do it however. I guess if it were me I'd give it a try.
I just thought of an easier way to check the 180 error. Turning over the engine by hand you would find that you have no compression half the time you go past a TDC mark. It would have compression only every 240 degrees instead of 120 degrees.
-Andy
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72 Carrera RS replica, Spec 911 racer
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