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From what I'v hear, not sure how true, but the OBD0 b18a1 are stonger. But any Block will work. IF you need the LS/vtec oil feed line, let me know. I will sell you some for dirty cheap, Never used.
so if i put b16 pistons in my block it will give me like 15 to 20 more hp?
If you don't have high compression for vtec, it's not really worth it besides the torque you are gaining. I have made motor's with stock ls blocks with a vtec head, but was also adding turbo kit's too them. If you are going N/A put those B16a pistons in the LS block and run some ITR or CTR cams and you should be able to put down around 175 whp easy. With some good headers, intake and tuning.