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Thread: Differences between an E31 and E88 on a L24

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    Registered User 5150 will's Avatar
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    Default Differences between an E31 and E88 on a L24

    Well, it seems my E31 head is too eaten up by electrolysis to be cost effective to repair. I was able to get what appears to be a good E88 head from a friend. Are there any differences I should be aware of between the two heads on an otherwise stock L24?
    '71 240z 907 Green/Butterscotch Interior 81,000+ original miles
    HLS30-31061 5/71

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    Registered User madkaw's Avatar
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    Should work fine. What to watch for is the exhaust valve size and cylinder wall clearance. Depending on what e-88 head you have you might be taking a step down in performance. The early e88 is the better head. Did you get a price on fixing the e31?
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

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    Registered User 5150 will's Avatar
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    Thanks Steve. I believe the head came off a '73. Does that sound right? The price on repairs for the E31 is going to be way north of $700
    '71 240z 907 Green/Butterscotch Interior 81,000+ original miles
    HLS30-31061 5/71

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    Registered User 5150 will's Avatar
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    So, after searching, if I'm correct, the early E88 head has the same size exhaust valve as the E31? If the E88 I have has the larger exhaust valve, I guess I'll need to notch the cylinder?
    '71 240z 907 Green/Butterscotch Interior 81,000+ original miles
    HLS30-31061 5/71

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