04-01-2021, 03:32 PM
Hi Steve
Cracks from the centre stud have been mentioned in the past as being not uncommon. When my own block came back from sleeving, it had two barely visible hairline cracks in the same position. I am pretty certain it wasn't cracked before I sent it off, but have no photos. For what it's worth I pressed ahead and used it. That was 15 years and 10,000 miles ago (road use) and I have had no leaks, just used a normal copper/composite HC gasket with a light smear of grease.
However, your centre stud looks like it has been rethreaded or helicoiled, and the cracks have a visible gap, not just a hairline. There also looks to be a another crack between cylinder 3 and cylinder 4. It's your choice whether to risk carrying on or get a better block, I guess in the end it comes down to how you price your time !
Cracks from the centre stud have been mentioned in the past as being not uncommon. When my own block came back from sleeving, it had two barely visible hairline cracks in the same position. I am pretty certain it wasn't cracked before I sent it off, but have no photos. For what it's worth I pressed ahead and used it. That was 15 years and 10,000 miles ago (road use) and I have had no leaks, just used a normal copper/composite HC gasket with a light smear of grease.
However, your centre stud looks like it has been rethreaded or helicoiled, and the cracks have a visible gap, not just a hairline. There also looks to be a another crack between cylinder 3 and cylinder 4. It's your choice whether to risk carrying on or get a better block, I guess in the end it comes down to how you price your time !