Difference between 289 and 302 - Mustang Evolution

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Old 10-14-2011, 10:37 AM   #1
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Difference between 289 and 302

My wife and I bought a 65 coupe a couple days ago. The place where we bought said it had a 302 in it. Other than looking on the block for the code is there an easy way to see if it is a 302 or maybe if it's a 289? Any help would be great.
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Old 10-14-2011, 10:59 AM   #2
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The blocks are the same between the two. Here's a link that will help you some I hope.
http://www.classicmustang.com/casting_numbers.htm
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Old 10-14-2011, 11:09 AM   #3
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Thanks for your help
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Old 10-14-2011, 11:14 AM   #4
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Np, happy to help.
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Old 10-14-2011, 11:26 AM   #5
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Re: Difference between 289 and 302

pull a valve cover off , there's usually 289 / 302 cast into the rocker arm area of the cyl head , or get the casting numbers off of them and run them
being a 65 I'd say 289 / they didn't start putting 302's in them till late 68
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Old 10-14-2011, 11:43 AM   #6
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Thanks. I know this is not the original motor. The vin shows to have an I6 installed.
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Old 10-14-2011, 12:08 PM   #7
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Quote:
Originally Posted by stampde
pull a valve cover off , there's usually 289 / 302 cast into the rocker arm area of the cyl head , or get the casting numbers off of them and run them
being a 65 I'd say 289 / they didn't start putting 302's in them till late 68
The head doesnt really tell you if the block is a 289, only the head.
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Old 10-14-2011, 12:58 PM   #8
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Re: Difference between 289 and 302

Quote:
Originally Posted by 93slowstang View Post
The head doesnt really tell you if the block is a 289, only the head.
true , but i'd put good money on it being an '89 if it has the heads

---------- Post added at 11:58 AM ---------- Previous post was at 11:56 AM ----------

but I use to put 289 heads on the 5.0 roller blocks for a compression bump ,back in the day
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Old 10-14-2011, 04:25 PM   #9
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Quote:
Originally Posted by stampde

true , but i'd put good money on it being an '89 if it has the heads

---------- Post added at 11:58 AM ---------- Previous post was at 11:56 AM ----------

but I use to put 289 heads on the 5.0 roller blocks for a compression bump ,back in the day
That's what I was getting at
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Old 10-14-2011, 06:13 PM   #10
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Thanks for your help
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Old 10-14-2011, 06:33 PM   #11
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A good sign is that the 302 harmonic balancer is a lot thicker than a 289.
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Old 10-16-2011, 06:50 PM   #12
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Doesn't a 302 have the smaller spark plugs?
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Old 10-16-2011, 09:47 PM   #13
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No they are the same size I believe. Newer ones I'm sure have changed
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