None exist and haven't for a very long time.
Help us here Marc. We're push rod guys so re-grinding an old stick to a smaller base circle but higher lobe lifts can be 'fixed' with longer push rods.
Are you saying that current blanks can't be cut to the 'H' spec because there is not enough material in the rough cast lobe?
I get it that with an OHC setup the cam is running directly on the valve stem - so a blank cam shafts gross lobe diameter is the limit of lift that can be be ground in.
