>>Valve lift is related to cam lobe height by the rocker arm ratio. I don't
>>know what an MG's rocker arm ratio is. A small block Chevy ratio is 1.5:1.
>>so .100 lift at the cam = .150 lift at the valve. In mechanical valve
>>lifter cars such as an MG you must also subtract valve lash. So valve lift
>>= (lobe height - valve lash) * rocker arm ratio.
Professor ... is 'valve lash' caused by the 'valve clearance' that I
the screw on the rocker arm? IOW, can I substitute 'valve clearance' for
'valve lash' in the above equation or are there other factors involved?
If my memory serves me ... the rocker arm ratio is 1.426:1
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