I bought a aluminum head that I thought it would fit my 51 Packard 327 s8, but when I received it it was to small!! So I'm guessing that this head is for the smaller s8. So does anybody here know when packard make the aluminum cylinder head and are they good to install or junk. This is just for my information. If anybody here wants to get it as well let me know because I can't use. Thanks Ed.