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If you are going to have the head machined the injectors will need to be removed. The injector tips stick out of the block side of the head. There are a few post on here that show you how to build a wrench to remove the lower head nuts. I made a wrench from a cut down boxed end wrench and welded...

If you are going to have the heads machined make sure they understand the maxium amount that can be removed. Some shops will get the head setup close and take .005 or .010 cuts until it is cleaned up. Not a problem on most gas motors it won't work on these.They should be machined on a grinder...

I have replaced head gaskets on two different ldt 465 engines this year and had the heads reworked on one of them. There is almost always some kind of issue when dealing with the exhaust and turbo. At least a few broke bolts so be prepared for that. I think 3 days is minimum. If you are going...