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Building a Forged Bottom End for LTG

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So now that we can purchase the block separately, I have a few questions that I'm having trouble finding answers for.

My plan is to buy the block, buy ZZP JE forged piston, molnar rods, and a factory crankshaft and have the bottom end assembled. I would most likely attempt to get the oil pan off the busted engine but I'm sure I'd have to drop the subframe to do that and at that point I may just buy a new oil pan too. I'm planning this under the assumption that the blown ringland in cylinder 4 has scored the cylinder wall.

My first question is would it be practical to rebuild the block beforehand then just have it installed, or have everything taken out and rebuilt all at once? I may be able to have the block and bottom end built cheaper separately and was hoping to save on installation by just having them install the block rather than take it out, rebuild it, then put it back in.

My second question is can you drop the subframe and just take the bottom end and block off or will the entire engine need to come on out? Pardon my ignorance, I'm obviously no engine builder, I just thought asking was worth a shot.

Also, if you think I'm all together going in the wrong direction here, I'm open to suggestions on how to get this done the fastest, least painful, and cheapest way possible. Thanks for reading!

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