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What`s the mileage of the car? The side rails are pretty sturdy, at least in my 5-chain engine I just reused them after 100k miles because they were totally fine. What makes you think they might have to be replaced?
If you pull out the scavanging pumps you can look down on the rails using a mirror or a borescope, at least on my engine, which again, is a 5-chain. And it`s on a stand in my garage so there`s plenty of room, which may be different when the engine is in the car. To see the inner surface of the rails of course you would need to remove the tensioners (locking the camshafts too) so you can pull the chain off the rail using a wire or similar. I`m not 100% sure, but I think this inspection is doable without pulling the valve covers off.
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