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Thread: Is this head gonna be ok???

  1. #1
    Registered User 5150 will's Avatar
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    Default Is this head gonna be ok???

    I took my head off tonight to do the HG and all was fine till I turned it over and found this in # 6......What do you guys think? Repairable?Click image for larger version. 

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    '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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    Sorry those pics didn't turn out very well. Basically the chamber looks like it's pitted vs. all the others that still have the machine finish (under the carbon of course). The sidewall near the exhaust valve has some fairly good pits. I tried to get them in the two pics. It looks like either detonation, or possibly corrosion.
    '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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    It's repairable, but it will have to be welded and machined. Time to do a rebuild on the head. Looks like you have an early e-88 which would be worth the effort. Or you can find another head in better shape.
    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. It's actually an E31. I'll take it somewhere to get looked at and see what the damages are gonna be.
    '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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    Oh its an e-31 head. Well I think you might have an issue that was problematic with the e-31 heads. You definetly need to have the head checked out, but might be worth the effort. Becareful though, you might catch that awful 'while i'm at it disease' and put bigger valves and unshroud, ect.............
    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

  6. #6
    Nova Scotia,Canada,Earth Blue's Avatar
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    Jan 71 240z with e31 and same problem... the piston is also peppered with holes and much lighter. New head and pistons....
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
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  7. #7
    Registered User 5150 will's Avatar
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    Blue, I did some searching and saw the pics you posted of yours. Mine doesn't look as severe, but I'm guessing it would be electrolysis. My car did sit for 23 years before I got it and I'm pretty sure there might have been some HG leaking going on before it was parked. It does/did run good though.....
    '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, when I take this thing in, if the shop I go to checks it out and feels its repairable, what do you guys feel is "reasonable" price wise to have it refreshed? I'm not gonna go off the deep end or anything, just what should be done. I've had some suggestions on where to take it from a friend who's more of a motor guy than I am but I've never had to have any head work done and don't want to get $crewd in the process.
    '71 240z 907 Green/Butterscotch Interior 81,000+ original miles
    HLS30-31061 5/71

  9. #9
    Supporting Member Diseazd's Avatar
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    I had an E31 with exactly the same problem in number 6. It was caused by electrolysis. A reputable shop can fix it for $50.00 to $75.00.
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  10. #10
    Registered User 5150 will's Avatar
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    Dropped my head off today at a reputable recommended shop and they are gonna check it out and work it over for me. He said he's seen and repaired much worse.
    '71 240z 907 Green/Butterscotch Interior 81,000+ original miles
    HLS30-31061 5/71

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