Hedgehog Once got a lesson on those sixes,we had a head come in ,ground the valvesand used aircraft magnaflux on it which was far superior to "dust"magnaflux (had been hot) shortly they came back antifreeze in the oil ! It wasn't long till it took a shortblock (same head)fixed it. Not much later we smelled a rat from a report from someone else. Went and looked at that core, lifter bores cracked,so watch your heat !!
