Misalignment of the rods on the small ends was suggested and on reflection there was a slight rattle from the engine on its last trip when really hot(ran for a good few miles down on oil ,service station closed for refurb)and it was suggested that it may have been coming from the small ends. The crank journal radius were measured at .08 on three but the timing side inner measured .1 , crank journals in good shape standard clearance. This engine was a mix n' match job with parts collected from Evilbay and new parts from AN.
Pistons are 73.5 , the engine was last run on a dyno in May 18 ,revved up to 7000rpm and there was no strange noises, well non that I heard anyway.
Rod caps seemed to match marks on rods, but again bought off eBay??