A10 Alloy cylinder head

[Gearbox]

I have just taken the head off my A10 motor to sort a few small oil leaks on the rocker covers and also to change the valve springs as they have been in there for about 40 years.
I noticed that the previous owner had put 2 washers under the head bolts and there was some dishing of the head bolt holes. The bolts were easy to remove.
I have ordered some new bolts and washers from SRM and am waiting for them to arrive.
The advice I am after is what to do about the dishing of the bolt holes. Would it be ok to fit the head as is but with the correct bolts/washers or do I need to get something done about the holes? Is there something I can do or does it have to go to an engineering place to be sorted.
Thanks in advance
Seamus

[orabanda]

The seat under the washer needs to be flat to prevent eventual loosening of the bolt.
They should be spot faced, which is a simple procedure.
Richard

[Gearbox]

Thank you Richard. I assume spot faced means machined flat around the diameter of the washer. Not heard of the term, is it something that can be done with basic tools or does it need to go to a specialist?

[RDfella]

Ideally you need a mill and an end mill the same OD as the seat to cut the seats. Then apply a light countersink. You might consider thicker hard washers instead of standard ones.

[Gearbox]

Thanks for the information. I will speak to a couple of machinists that I know and hopefully have it repaired. I dis think of putting another washer on the standard one to bring the hight of the head back to normal.
Appreciate the help