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I dont know about the cost, but port and polish has to do with the head, but will help with the cams, probably wanna get new valve springs too to hold the higher lift. and I know the b18b isnt exactly 1.8 lters so i doubt the B20 is exactly 2.0 liters, so just get it bored to 84mm then you can buy pistons intended for the B20. or you could bore it to 85mm and get the .40 over B20 pistons. what cr ratio depends on what your plans are, but wiht the stage 2 cams Im guessing no forced induction so Id say somewhere around 10:1.
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current
-84 datsun 720 4x4(2nd time)-93 accord-90 camry V6-90 warrior-94 300ex
history:
-01 R1-04 daytona 600-94 teg RS-95 teg LS
-91 teg RS-92 teg GSR-94 civic CX hatch (3 times)
-94 civic DX-96 civic HX-97 Accord LX-72 superbeetle
-74 beetle-84 silverado-66 c10-74 maverick-78 280z
-84 200sx-86 tercel wagon-95 mustang V6
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