yes I do tend to over think things.
My new roller Engine has new Eddlebrock heads...so I am truly just analizing an issue that has many answers (the more I research the more I learn), my car has hardened heads.
A moment ago I read something here that touched close to what I was thinking.
Perhaps by the time unleaded gas came out, some heads wear starting to wear in already.
Earlier year cars with leaded gas may have worn in as well( I have no way to know) those earlier cars from the 50's tended to be fairly traded in before they would spend money to have them rebuilt (my thought).
Hang in hear for one more thought please. Could the problem be with using a cheaper blend of steel for the making of heads....or do cars from the 50's classic era show sunken heads as well during the unleaded introduction.
If...and I say if...this be the case, time may have taken a toll on these heads with leaded gas, and then started showing its demise in later years, laying it square in the face of unleaded blame as a coincidents.
I guess I feel it may be presumptuous to see sunken heads after cracking open an engine and blaming the fuel. WAIT
It may be a possibility as well as leaded gas may be the culprit. As cars got more expensive , people started having them rebuilt. This may have been the case in earlier years if people drove as much as the future cars started being driven in a busier world. People lived in shorter driving distances from work and were still rural. The same people did not abuse muscle machines as much...things were tighter.
hey...I am just saying that there are many variables than just one blame.
ya know it might be the unleaded.
...Everything mechanical is logical...emotions are not logical...if I am wrong about the logic thing, then perhaps the unleaded thing that seams logical ...is not. Thanks for letting me chat and learn.
P.S. I am not an environmentalist...I shoot deer every year...I cut down trees cause they regrow (and they are a good source of heat)...I have never hugged a tree...The polar areas were warmer in the 30's than they are now.