Hi everyone,
I picked up a head that had a gouge in the chamber, that ran slightly into the valve seat. It looked like an angle grinder or something had hit it.
I ground it down to get rid of it, but to a depth that left only a smidge of the original seat.

Could it be used if new seats were cut?

I know it would pose problems with rocker geometry etc, but I figured if I use shims under the rocker posts and Cooper S valves, maybe???

Just recut the seats. Or fit unleaded inserts.

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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 Doc, that’s good to hear. Do you think the rocker angles etc will be workable?

What is the casting number on the head, near the rocker posts?

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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.

It’s a 12G940. (12938 or something near the thermostat)

OK. It's a Morris 1100S or 1300 auto head.
Just recut the seats, or get unleaded exhaust inserts fitted. Use standard 1100S valves or MK 2 S inlets if you prefer.
Shims are available to pack up the rockers if needed (usually not with a modified cam), also to pack up the springs to optimise assembled height.

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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.