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I just recently learned a little bit about this conversion. You need to have a lot of work dont to the block to make sure it can handle the high revs. A stock LS block will not be stable for very long above 7k rpm. The LS block needs to have holes drilled in it for the oil line because the block is not made for vtec, so a professional needs to drill a hole for the oil line. It is said that you need at least a b16 oil pump for proper lubrication. You could use type r pistons instead of the ls pistons, I think you could raise your copmression with them (not 100% sure).
The type r head must be complete. Meaning the cams, cam gears, etc. should all be from the type r.
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