Well I can tell you for sure they are R45TS and are tapered but they were in there. What made me run the numbers was the fact I had a 13/16 plug socket in hand and was surprised to see the R45TS. I'm guessing the PO put the plugs in to cure a miss, which was caused by the vacuum leak at intake and advance. BTW that little ball was fun to find for TDC but I took HRL advice and watched the valves, then I found it.
