Good evening Arial, Marshall fitted 1 1/2" governor heads with 1 1/4" valves to the 5 ton tractors, i do not know the reason why. The build sheets state 1 1/4" governor so that is what mine and Hedd's is fitted with. If you look at photos of Jingling Geordie it still has its original fitted and is a 1 1/2" head. If you could obtain a valve that was longer than the drawing you could cut and shut the valve with a bit of care. Regards, Neil.
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