Well...in fact only one cylinder was sleeved. This is a good block with only 80-100 miles on it, and had a piston disintegrate in it. The scuff did not come out with the usual .020" overbore, so pressing in a sleeve to fix it was the only way. To be honest, i didn't even know that this has been done forour motor. Whenever I thought of sleeves, i always thought of Darton/AEBS T-sleeves.

So, here are some pics...




Our stock motors have the steel inserts from about 2mm below deck down. The block Al casting is done over and under them at each cylinder. So the machinst (who has over 30 years of experience) said that this is the way to repair them, and I am inclined to trust them. In fact, Daron makes inserts such as this from the same material as their T-sleeves. I have heard of at least one insanely high HP car that has been runnign them well (and I mean well) over 1000hp before they started to have issues with it. So that's another avenue that has not been undertaken by the Z community that I believe deserves consideration.


A question for the EXPERTS: the sleeve is about 1/2 a thou (0.0005") above the deck. I am sure the headgasket will byte on that cylinder, but do you think that it will create issues on the other two cylinders on that bank by virtue of having had lifted the head in one point.

 

dumb question... why not just lap off the 5 ten thousands? Granite table + Diamond lap + lubrication = gone, no?

Do you know the exact material of the head gasket, type of aluminum? As long as you don't pass the elastic limit of the gasket you should be ok as far as concerning 'head lift' as you described (at least that's what I would think).

Good Luck.

 

Hey Neff

I think they were trying ot be careful and not nick the stock portion of hte cylinder, hence staying half a thou up?! I doubt that the elastic limit of the gasket will be overcome...but, i'll be calling Cometic today as well.