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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 09-09-2008   #1 (permalink)
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Default difference in 289 and 302?

Can I look at the engine in the car and tell them apart. I read on the Windsor and Cleavland differences and was wondering if there were noticeable differences on these engines?
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Unread 09-09-2008   #2 (permalink)
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there are really no noticeable differences between these two engines. other than numbers that were stamped on the block. cause really the 302 was a bored out 289.
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Unread 09-09-2008   #3 (permalink)
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Actually, the 302 was a stroked 289. The bore was the same.

289 bore 4.005" stroke 2.87"

302 bore 4.005" stroke 3.00"

Casting numbers is one way to tell a 302 from a 289. Intakes with C9 ('69), D0 ('70), ... are 302 parts. 1968 is when the 302 was introduced in the Mustang, although the 289 was still available that year. 289 heads have 289 stamped in the valve area under the valve cover. I think the block date code is behind the starter.
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Unread 09-09-2008   #4 (permalink)
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ok thanks i thought that ford just bored out the 289 cause they had a lot of space to do it. Thank you for correcting me.

BTW i have a 1968 coupe with the 289. I personally think that the 289 was one of the best engines that ford ever built. They are practly bullet proof.
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Unread 09-10-2008   #5 (permalink)
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Some of the late 289s were actually built using the 302 casting numbered blocks. There was a shortage of the designated 289 blocks which had a slightly shorter cyl. wall length (something redicilous like .060" difference). The sure way to know what you have is to check the crankshaft casting number.

The C8OE-A casting is a 302 block that was used for building the late 289s. You can build a 302 using a 289 block, but you may encounter a bit of piston skirt slap at the bottom of the bore due to the reduced cylinder length.
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Unread 09-10-2008   #6 (permalink)
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Quote:
Originally Posted by Warrior 2011 View Post
....They are practly bullet proof.
Great engine, but I have killed one before years ago. Cracked the block and one cylinder head. The best guess from so called experts at the time was a stuck thermostat.
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Unread 09-10-2008   #7 (permalink)
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Thanks guys,the reason I ask is I was having some work done on a 65 coupe I have and the mechanic said it was a 302 and not a 289 and that very few people could tell.Seems like he said the timing cover was different.
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Unread 09-10-2008   #8 (permalink)
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thanks for that info it mite explain a few mysteries about my engine.

How did you manage to crack the block? Could a stuck thermostat really do that?
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-Jared 1968 Coupe 289 4V (Daily Driver).
What i've done...
-New steering box and front end rebuild
-New interior
-Disc brakes and brake system rebuild
-Edelbrock 4V
-New Exhaust (neighbors love me in the a.m)
-And to many other things to mention
All by the age of 18
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Unread 09-10-2008   #9 (permalink)
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Keep in mind that the 260 could also be confused for a 289 or 302 or vice-versa.
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Unread 09-10-2008   #10 (permalink)
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i thought that the 260 was a lot smaller than the 289/302's. Plus they were only put into the 1964 1/2's and early 1965's.
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-Jared 1968 Coupe 289 4V (Daily Driver).
What i've done...
-New steering box and front end rebuild
-New interior
-Disc brakes and brake system rebuild
-Edelbrock 4V
-New Exhaust (neighbors love me in the a.m)
-And to many other things to mention
All by the age of 18
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Unread 09-10-2008   #11 (permalink)
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260 is in the same family of small blocks as 289 and 302.

Essentially, a 289 is a bored out 260.

260 - bore: 3.80" stroke: 2.87"
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Unread 09-11-2008   #12 (permalink)
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There isn't enough material in the cyl. walls to expand the bore size to 4". You can't make a 289 or 302 out of the 260 block.

The bolt pattern for the bellhousing is the early 5 bolt not the later 6 bolt. Some 289s were 5 bolt, the later 289s went to the 6 bolt pattern. This change was in 65. There were no 260s with a 6 bolt bellhousing pattern.

The cyl. heads used smaller valves also. The 221 and 260 engines are in the same family as the 289/302 and externally they have the same dimensions. It's the thickness of the cyl walls in the castings and the number of freeze plugs on the side of the block is 2 vs the 3 plugs on 289/302.
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Unread 09-11-2008   #13 (permalink)
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I have always heard that the pad on block behind the intake will be flat 1/2 across it on a 302 and sunk in all the way across on 289 if that helps..
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