Title says it all. My block has a crack between the middle sleeves right in the middle. Would it be safe to use a MLS headgasket or is the block trash? The sleeves are still good. I plan to boost the engine. Im not too experienced with rebuilds. This is my first sleeved open deck engine.

 

It might work for a short while if you leave it stock... it likely won't survive the dyno tuning session if left as is. Replace the block and then boost it.

 

Yeah I was afraid of that, I checked and my mls headgasket has ridges that seal on the sleeves. I saw on some diesel tractor forums that people have gotten away with similar cracked blocks on their older tractors. But of course it's different. Im not sure where to get a cheap block, I already got custom forged pistons. There's a block at the junkyard for about 150 but the car has bad motor spray painted on it. And it's got 200k miles