2.5NA maximum head skim?

Hi everyone
For a 2.5 NA (12J) does anyone know what the minimum clearance is between valve face and cylinder head gasket face?
I have a a head which I suspect has been skimmed several times. The valve faces still sit below the gasket face of the head...but only just! Is there likely to be a clearance issue with the top of the pistons?
I cant find a minimum clearance value listed anywhere.
Many Thanks
Andy

no spec was given,you can cut valve seats to sit valve further in

jamesmartin said:

no spec was given,you can cut valve seats to sit valve further in

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Thanks
The value I’m looking for (as I’ve just been advised) is ‘Valve stand-down’. If I check valve/piston clearance with plasticine what sort of value am I looking for?
Ta!

90project said:

Thanks
The value I’m looking for (as I’ve just been advised) is ‘Valve stand-down’. If I check valve/piston clearance with plasticine what sort of value am I looking for?
Ta!

Click to expand...

it is indeed termed as such but there aint no value given, the pistons dont protrude above the block like on late engines, your best bet is to fit the head using the old gasket if possible and use your plasticine then turning the engine over twice

jamesmartin said:

it is indeed termed as such but there aint no value given, the pistons dont protrude above the block like on late engines, your best bet is to fit the head using the old gasket if possible and use your plasticine then turning the engine over twice

Click to expand...

Cheers...much appreciated