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Service blocks were offered throughout the latter life of the 427, as they are with every engine. Go to a Ford catalog today. They offer 351 blocks, 302 and 4.6L blocks.. Were some released that shouldn't have been.. Sure, as with everything.. We have all heard about Monday morning and Friday afternoon products of all kinds.
427 service blocks always had the latest design revisions for their type. My 1966 (sept 1966) is fitted for hydraulic OR solid lifters, this didn't make it to production line 427's until 1968. My block doesn't have a engineering number cast into it, i.e. C6AE.. Does this make it worth less? Why would it. Late production service blocks had thicker cylinder walls and are stronger by the employment of squared off cylinder wall castings as opposed to the round ones from 63-65..
If you are looking for an "original" Cobra engine block it won't be found in service block.. But neither are any of those you have seen offered for sale either..
Regards,
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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