I am building a b20 wit gsr head. I have some wiseco pistons from my turbo build that I would like to use with this build. 84mm with the b20 block, pistons said 8:5:1 w/o vtec head and 9:5:1 with b16 head. I know the compression changes a little with the gsr head and smaller combustion chamber,can anyone tell me about what it should b around with an oem hg. And I plan on spraying it, first time to mess around with nitrous, would this comp ratio b good with spray or should I go higher? Thanks ( fully built head, pro2 cams, built bottom end, stock sleeves)

 

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