289
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The 302 replaced the 289 in 1968. It's really almost the same motor, as the 302 is a stroked 289. The stroke on the 289 is 2.87 inches. The stroke on the 302 is 3.00 inches. The pistons are the same, but the 289 rods are 5.155 inches long, and the 302 uses 5.090 inch long rods. The 289 had slightly less stroke, but a slightly better rod/stroke ratio of 1.84, compared to 1.699.
The 302 used a slightly improved block, with longer cylinders for improved piston stability, and it also had better flowing water passages, for better cooling. The 302 block is actually a better block, but both the 302, or the 289 bottom ends, can be used in either block. Later 302's didn't use a two piece oil seal , but I'm unsure of when the change was made.
The 302 used a slightly improved block, with longer cylinders for improved piston stability, and it also had better flowing water passages, for better cooling. The 302 block is actually a better block, but both the 302, or the 289 bottom ends, can be used in either block. Later 302's didn't use a two piece oil seal , but I'm unsure of when the change was made.
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Yes, that's correct, as long as the crank and block are designed to use the same rear mains seal. You may have to check on that. Some blocks used two peice seals, and late model 302's switched to one peice rear seals later on. As long as the crank journal, at the seal, is the same, it's just a matter of matching up the seal to the block, and cap. But diffinately take some measurements. Later 302 blocks also have a hole for the dipstick tube on the drivers side of the block, that the early 289's and 302's didn't have.
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