We run an Escort Coswoth rally car here in New Zealand and have recently installed a tubular SS exhaust manifold. The car is currently about 400hp running 21lb boost. The manifold runs white (almost clear) hot. On our last outing we observed high oil pressures and destroyed a valve, lifter, cam etc. I am wondering if the problem may be oil flashing in the horizontal gallery on the exhaust side of the head (this is just above the exhaust manifold) and hence both reducing lubrication to the cams and lifters and also causing the pressure to rise as the oil gas would presumably have a significantly higher volume nad hence grreater pressure drop through the head. Has anyone out there any ideas??? Cheers John