RE: TR6 heads

["Ricker, Brian R." <rickerbr@Maritz.com>]

> Based on what little I know the compression ratio was dropped 
> in 1972 and
> again in 1974 to allow the engine to pass the more stringent 
> NOx emissions
> standards. The compression ratio was dropped by simply increasing the
> thickness of the gasket side of the casting. Why not 
> uncorrect the problem
> by just shaving the head. 
> 
> Still confused and standing (on my head)in the odds and ends corner

Is the concern that once a head is overmilled obviously it is a throwaway
item and 
getting a replacement might be a problem?