I may do a leakdown test to confirm but a possible cause of my failure may have been due to me giving the car a bit of a belting before adjusting the tune for the change of headers.

Logs have always been good but recently I had increased consumption of oil and a dip in power up very high and unable to tune afrs away from very rich at the same rev range.

Graham is definitely very good and at the end of the day I choose to tune in this manner and I accept whatever consequences come of it. I may review this decision if I kill another engine....