I replaced the rods and mains on a TR-7 in situ once. Even though I had the car over a pit, it was dicey. I would never do that again- at least not in a car that has a crossmember or a 617 with the lower pan and the rope seal. It took me a looong time and I was very concerned about getting dirt in the bearings. My conclusion was that it would have been quicker to pull the engine. I suspect you will agree if you continue

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