Mystery connection, don't know what plugs into this, have a look Options

[jackspratt]

Wondering what this would have plugged into it. Looks like it's a ground of some sort and looks stock? Anyone have a clue? 1973 914 2.0

[emerygt350]

Yeah, the plug angle tells you and the number of studs on the intake ports. 3 studs per side is a 2.0. If the plugs are pointing up like yours it's a 1.7 and will have 4 studs for the intake runner.

As long as it is all 1.7 bore and stroke you should be fine. How to determine that is not as easy. If you do have a 2.0 bottom (case and crank) that is good news. They are both better built than the 1.7. I am not at all sure how you could easily determine the bore and stroke with the engine in the car. Perhaps others here have better info on that. I am not even certain you could slap 1.7 heads on a 2.0 . 2.0 heads are notorious for dropping valves/cracking near the plug etc etc so it wouldn't at all surprise me for someone to do it if it is possible. Problem is the valves on a 1.7 are much smaller than the 2.0 and they just can't breath like a 2.0. If you are serious about getting this thing going I think it is safe to get it running as is but just don't drive it too much and keep an eye on the temps until you are certain what you have. After you get it going I would suggest a cylinder head temp gauge and an air fuel ratio gauge, but that's not worth it until you have it going.