Spark Plugs - Different each side of engine.

[Seamus1982]

Morning All,

I bought a 1641 twin port a couple of years back. It was always intended to be a stop gap as needed something fast as our 1600 so had failed and we were about to head to Europe for 3 weeks.
I did a service recently on it and when I changed the plugs, the left hand cylinders had the standard W8AC short plugs in and the right hand cylinders had W8CC long plugs.

Any ideas why?

I’m going to pull the engine after I get back from the months France trip we are on at the moment.

 

[K@rlos]

I suspect 1 head has been replaced with a later version from a fuel injection engine

 

[Seamus1982]

Thanks @K@rlos

Would this have any impact on the running? My simple mind would think for the engine to run right and consist, any difference between the heads would have a negative affect. Compression/firing rations etc would be out, as the dissy wouldn't accommodate for those slight differences. Or am I overthinking it?