Long story short, the motor melted down a piston and it scored the wall .060-.080" deep so it won't clean up with an overbore. The machine shop wants to install a sleeve to repair this. I trust the shop thats it's at as they have a good track record, but how will this hold up to 600 whp at 40 psi?

I know some people use the 4g64 blocks but i just don't have the time to look into all of that and i'm assuming the 4g63 blocks are damn near impossible to find.

 

what kind of sleeves? sleeved blocks can handle a lot of abuse.

eh, just searched, 4g63 blocks are iron, not many sleeve em.
they also said the 4g63 blocks are a dime a dozen to find.

 

Usually when you sleeve your cylinder, you do it to go beyond advertised power and if done right the sleeve will not have any problems holding 600whp+, look at all those high power Evo X's, all of them are sleeved, but if not done right, there's a possibility of dropping them.

 

I know all the evo x blocks are sleeved but that seems like a different animal as it's all aluminum. I guess i'm looking for real world examples.

 

I'm kind of boggled. A machine shop gave you a reading of within .020"
Thats huge. Most metals technology guys have tolerances of .005, for reference, a sheet of paper is .003

 

It's kind of hard to measure the depth of a gouge in a cylinder wall. It was an estimate based on what they could measure. I'm a manufacturing/ machining engineer by trade so i'm well aware of how these things work. I have some parts that hold diameter to ±.0002 with a true position of .0005. CPK of 1.0 + even with those tolerances.