Visual differences in 260 and 289 engines - Vintage Mustang Forums

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post #1 of 6 (permalink) Old 06-02-2004, 09:37 PM Thread Starter
Join Date: May 2004
Location: Atlanta, Ga
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I got some bad news tonight...
My 64 1/2 (that was purchased new by my Mom) was driven from a few years by my bonehead uncle. According to her, he blew the original 260 engine. {moment of silence}

She thinks he replaced it with a 289. (or to quote my mom "a 280 something")

Long story short, is there a visual difference in the 260 and 289 engines. I had hopes of fully restoring it some day, but this could make things difficult.

How hard is it to find a 260 engine?




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post #2 of 6 (permalink) Old 06-02-2004, 09:41 PM
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There will be virtually no visible difference in an EARLY 289 and the 260. The easiest to spot though, if it's a later 289 or 302 is the 6 bolt bell housing pattern (260 is a 5 bolt).

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post #3 of 6 (permalink) Old 06-03-2004, 01:15 AM
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I would assume with the different bore size of 260 vs. 289 that the heads are
not interchangeable? then switching from 260 to 289 would require swapping in
a complete long block. so maybe just pulling the valve cover might reveal
the engine size stamping (assuming the engine isn't a complete mis-match of
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post #4 of 6 (permalink) Old 06-03-2004, 06:13 AM
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I have lost or lent my Monroe, so this is a bit vague, but IIRC, early 289 had same valves as 260.

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post #5 of 6 (permalink) Old 06-03-2004, 10:01 AM
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Some GENERAL tips, but not conclusive:

Are the valve covers sealed (260, early 289) or have an oil fill cap

Is the timing chain cover have a big inlet for oil sticking up, or at least a plug looking thing when a pipe would go on the passenger side.

Is the timing pointer cast in or bolted on?

5 bolt or 6 bolt style bell housing

cast date on the heads or intake (better yet block located near the starter)

The 260 heads can be run on a 289 and v/v. The bore on the block is 3.8 vs 4.0 ed ay +3112

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post #6 of 6 (permalink) Old 06-03-2004, 11:27 AM
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If you really want to know, drop the starter and get the casting #'s off the block. Post the numbers here and either myself or another can determine what block you have.
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