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Bronze or Cast Iron Valve Guides?

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  • Bronze or Cast Iron Valve Guides?

    It has been awhile since I have posted or even checked Z31p, but I was hoping to get some advice or opinions on an issue.

    So, I have some heads that I am working on that have some cracked valve guides. Should I go with bronze or cast iron? The heads are going on a turbo build with some mild performance. End goal is to land somewhere between 300 and 400 hp.

    What do you all think? Steel valves with bronze or cast iron guides?
    Shiro #93
    Mods: A/C Removal, Custom Lightweight W-series crank pulley, K&N Air Filter, Electric Fan, EGR/AIV/CC removal