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Just to clarify Richard's statement about "302 blocks being used for 289 engines", for those who may be confused.
At the start of 1967, both Cleveland and Windsor were building 289 engines. Cleveland continued using its C5AE-6015E casting blocks, while Windsor used its C6AE-6015C casting blocks. Sometime around May of 1967, Cleveland, feeling that it had enough of its C5AE-6015E blocks to complete any additional 289 orders for the 1967 Model year, began production of 302 blocks for the 1968 Model year. However, its inventory of the C5 blocks was exhausted before the end of the Model year. Cleveland then turned to using its 302 blocks (casting # C8OE-6015A) and 289 parts, to fulfill orders for 289 engines for the rest of the 1967 Model year.
Windsor, on the other hand, had enough of its C6AE blocks to complete its orders for the 1967 Model year.
Towards the end of the 1967 Model year, Windsor began casting 302 blocks (casting # C8OE-6015B) in anticipation of the 1968 Model year. However, it was then decided that all 302's would be built at the Cleveland Plant for 1968. Windsor still had an inventory of its C6AE blocks that it could use for the 1968 Model year, so it began building 289 engines using the C6AE blocks that it had used since mid - 1966. Once the C6AE blocks were depleted, Windsor, like Cleveland had done the year before, began using the 302 blocks (casting # C8OE-6015B) that it had cast previously, for the remainder of its 289 engines.
Thus the confusion ; one could find a 289 in 1967 built using a 302 block (C8OE-6015A) from the Cleveland Plant, or, in 1968, a 289 engine built using a 302 block (C8OE-6015B) from the Windsor Plant.
Bob
