Quote:
Originally posted by Rick Parker
I am in agreement that the 289 block itself is the same, apart from the main caps. I believe the oil galley plugs were screw in rather than press in. The freeze plugs are the standard fare press in type. You can convert them to screw in type (like the Boss 302). Also the bottoms of the cylinder bores are not as long as the 302 block and in a stroker application will not support the skirts of the pistons as well as the 302 block. There were a batch of 289 blocks cast which had 4 bolt mains, the block evolved into what became the Boss 302 block. A well built 289 is bullit proof!
Rick
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Does anyone know how a "C6FE" 289 block differs from a Hi-Po? Is a "C6FE" the Hi-Po with 4-bolt mains? "C6FE" blocks and heads were used in 1966 on competition GT40s and probably some race Cobras and GT350s too. I have seen an article on the "C6FE" heads, but what makes the "C6FE" block different or special I haven't found out yet. On stroking a 289, Ford contracted Holman-Moody to build 25 325CID stroker motors for the GT40 program in 1966. I don't have the specs with me, so perhaps there was an overbore in addition to stroking to get up to 325CID. The motors were not successful, having head sealing and block flex problems, so that engine program never went anywhere. I have one of those original 325 motors and am hoping that with almost 40-years advances in technology, we can get it to last as long as the revs are kept in check.