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from my 'knowledge', and I don't have a lot lol, clearances depends of the application of the engine (street, circuit, hard drag), BUT, the more harder/powerful applications you want, the biggest clearances you need, because of the expansion of materials.
It's not useles to read which clearances you have to use by applications from Wiseco, CP Pistons, Mahle etc....
When you know this, you can then, use clearances you need, and I always use measurement tools AND plastigauge, to confirm my measurements....
About ACL, I never understand WHY they sell 1 grade bearings where Nissan recommand 4 grades (for Nissan, I can't tell for other engine, but for Honda, it's the same, it"s recommanded to use OEM's)
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