351W stroked to 408ci, 450+ flywheel bhp.
I found I had a lot of problems using "regular" Castrol etc, all cured when I moved to Valvoline 20 50 racing
oil, non
synthetic. Still have a moderate
oil temp problem at trackdays, larger cooler on it's way for this year. Pressure OK at all times.
oil filter - Coopers Z1 or Motorcraft FL1A.
Wilf