On 12/1/2021, Colyn Firth wrote:
"On my 1950 cc pushrod engine (almost 140 BHP), I first tried the standard MGA vented tappet cover, but this resulted in a large amount of oil blow-through and resulted in an awful mess on the underside of the car.

The cure was to fit a single chest-type MGB vented tappet cover with the built-in oil trap, I fitted this in the front tappet cover position and this solved the problem. The vent pipe doesn't drip any oil at all now. The oil-trap cover has to be installed with the outlet facing upward".

"If you use the MGB oil-trap tappet cover on a Twin Cam engine, you may have to bend its outlet pipe to be more horizontal. I bent the pipe on mine using a plumbers spring to prevent kinking the pipe".