Stage 3 Minispeed Head (skimmed)

Hi there, i have a query about one of my heads

I have a minispeed stage 3 head that i had on my car but it kept blowing head gaskets so i took the head off and replaced it. then i got the head checked as i assumed it was warped and needed skimmed, turns out its already been skimmed and had far too much taken off it so its a really high compression, consequently blows head gaskets. It needs a decompression plate fittted when it is being used.

My question is, how much is it worth in this state?
I have a receipt from the previous owner from minispeed for £350
Is it even worth selling?

Could any metal be machined out of the combustion chamber to lower the compression ratio?

I wouldnt think its worth all that much to be honest, i would say £50 max really, as in theory the head is now scrap if the chambers cant be opened out...

dished pistons and a big head gasket ?


I dont no much but would you be able to try it

what size engine is this for ?

a engine with a rebore might bring the compression ratio down a bit

its for a 998cc.
I think you'd be able to open out the compression chamber on as there is no work done to this section. I know my dave vizard head i have on now has been opened out considerably around the compression chamber.

sound like it's not a stage 3 head then

probably just an unleaded conversion

nah mate, i have the receipts to prove.
and, it is ported on the inlets and exhausts and polished and has considerably larger valves than standard size.

but a stage 3 head should have some combustion Chamber work