Description
Darton Sleeves come semi-finished at 85mm so it leaves the sleeve thicker for higher boost applications.
Due to bore center you are very limited in the 2jz block with how thick a sleeve you can put in.
Making the bore at 85mm leaves the sleeve a little thicker so the sleeve has a little more structure since there isnt a lot of support from the cast iron block.
You arent really losing any power in a boosted application by going down just 1mm, you can make it up by easily pushing more boost safely.
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