I'd be interested in hearing more about this hardness test...
Obviously in an ideal world we would all use new castings, however there are clearly many occasions where this will not happen (non-availablity, cost etc). What I guess I am really asking is what people look for on 2nd hand castings...
Thanks a lot guys.
I think my main point is: if you were given a head for porting or skimming, or even if you wanted a replacement stock head for your car, how would you know whether the head was "soft" or not.
So far I have gleamed that an exaggerated gasket imprint, radically moved seats and...
I keep hearing people with aluminium heads claiming that their heads have gone soft after overheating and gasket failure. Does this phenomenon really occur and if so what temperature causes it and what problems does it cause (I imagine valve seat movement could be an issue).
How can you test...
