will take some pics tomorrow. the ports seem untouched there still quite dirty but feel like rough casting still.

Currently rebuilding an L18 and noticed that 2 & 3 exhaust ports are considerably larger than 1 & 4 on the seemingly un modified w53 head. Is this normal or have i got a one off freak. I have never heard it running so am unsure what effect if any this has on the engine. can anybody out there in datto land help me before i attack it with a die grinder?