Managed to break a heater tap stud in the head of a 1275 head, pretty well flush with the head surface

Any advice on removal, easy outs?, drill and re-tap?

3 Hail Merrys first.

Use a pin or flat face puch and gently tap a few times to try to get a bit of a flat surface on the stud first. Lightly centre punch and check with a gasket, if OK then punch again, drill and tap (1/4" UNF).

Don't bother with easy outs, it'll break too only making it harder to remove.

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What he said ^^^
When drilling, do it in a bench drill, NOT by hand. I have a head here that was drilled out by hand (not by me), it ran off centre and they drilled through the side of the head!! But I fixed it.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

thanks for that