7 port and 8 port

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  1. Hi!
    i want to ask you more questions about the 7 and 8 port heads.
    what are the principal industry that produce these heads? arden ex….
    so can you tell me about the datasheet? power, rpm,carbs,exhaust ex…
    so i think i will buy a used head but i don't know if the 7 or the 8 port.
    i would like to have 140cv, and i know i need modify all, piston, cam,exhaust, but i think the head is the most important piece.
    so please help me

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