Quote:
Originally Posted by Brock1030
Interesting though on this SR block, as it is not the later XX481988 block, but rather the earlier 500557 - pic attached. This car was sold Thanksgiving week in 1978 in Houston. When the failure happened, I surmised that perhaps the SR blocks available at that point in 1979 may have only been these earlier blocks or that they were using up the older SR stock W72 blocks first - any thoughts on that point?
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I can't begin to guess why Pontiac didn't supply your Trans Am with SR XX481988 block for the warranty claim, but now that I think about it, I also can't ever recall ever seeing one. That doesn't remotely suggest that SR XX481988 blocks don't exist, however!
Another possibility is that since Pontiac's last 400 block castings were produced in late November 1977, they prematurely exhausted the supply of SR XX481988 fitted block assemblies they produced by that time or that all XX481988 block castings were used for production vehicles.
Regardless, it's quite interesting to note that your block in an SR 500557 casting. I wouldn't have any concerns about its longevity or durability in your particular application. And speaking of that, your car is looks stunning!