How can I tell if my engine is a 302 or a 351? Super Confused! - Vintage Mustang Forums
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post #1 of 24 (permalink) Old 11-20-2010, 07:26 PM Thread Starter
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Alert How can I tell if my engine is a 302 or a 351? Super Confused!

Ok, so I have always thought that my engine was a 302, now I am beginning to have my doubts. I purchased spark plugs for the car yesterday and they sold me Autolite 45's. When I pulled out the plugs they are Autolite 24's. Every plug I look up for a 351 is either a 24 or a 25. Does this mean I have a 351? How can you tell what size your engine is? The original motor that same in this 72 was a 6cylinder (thats what the vin says) so that menthod wont help me

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post #2 of 24 (permalink) Old 11-20-2010, 07:40 PM
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The deck of the 351 was 1" higher, very visible where the timing cover meets the block. The corners of the cover are even with the deck on the 302, but the 351 is 1" higher.


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post #3 of 24 (permalink) Old 11-20-2010, 07:41 PM
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A big giveaway is the width of the intake manifold. A 289/302 is about 9" and the 351 is about 11".
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post #4 of 24 (permalink) Old 11-20-2010, 07:44 PM
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I'll crap myself if you pick up 48 cubes by changing the plugs
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post #5 of 24 (permalink) Old 11-20-2010, 07:45 PM
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Your firing order will be different on the 351 (13726548)

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post #6 of 24 (permalink) Old 11-20-2010, 09:48 PM
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The 302's changed to the thinner spark plug some time in the 70's.

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post #7 of 24 (permalink) Old 11-29-2010, 08:59 AM
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302 or 351?

I agree with the other posters with one exception, you may have a 351C engine. Does the thermostat housing point toward the front of the car or straight up?
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post #8 of 24 (permalink) Old 11-29-2010, 09:11 AM
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Originally Posted by motorking View Post
I agree with the other posters with one exception, you may have a 351C engine. Does the thermostat housing point toward the front of the car or straight up?
When I bought a 351W engine to rebuild, I was worried that it would be a 302 instead of a 351, although I made sure it had the wider intake. It had 6 bolt valve covers instead of the 5 bolt covers that were supposed to be another way to identify a 351. This engine is from a 1987 Ford so I guess there are some exceptions. Once I had removed the heads and intake I could see the
"351" cast into the lifter valley.

So, for my curiosity, would a 351C have the same "351" casting in the lifter valley as the 351W?
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post #9 of 24 (permalink) Old 11-29-2010, 09:36 AM
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[quote=rdlagray;4040697]Your firing order will be different on the 351 (13726548)

+1

Probably the easiest way to identify.
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post #10 of 24 (permalink) Old 11-29-2010, 10:12 AM
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Not really, 302's have had the 351 firing order since 1982.

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post #11 of 24 (permalink) Old 11-29-2010, 02:00 PM Thread Starter
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The thermostat on my mustang

Ok, well it appears that the t-stat housing is a double outlet style that points toward the front of the car and slightly upward. I attached a pic of what it looks like.


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post #12 of 24 (permalink) Old 11-29-2010, 02:40 PM
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Originally Posted by archifx View Post
Ok, well it appears that the t-stat housing is a double outlet style that points toward the front of the car and slightly upward. I attached a pic of what it looks like.

OK, we know not it's not a Cleveland, but the 289, 302, and 351W all used that same thermostat housing. This would be over in about 2 seconds if you posted a photo of your engine.

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post #13 of 24 (permalink) Old 11-29-2010, 02:44 PM Thread Starter
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Photos of my engine

Here are the pictures of my engine










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post #14 of 24 (permalink) Old 11-29-2010, 02:46 PM Thread Starter
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post #15 of 24 (permalink) Old 11-29-2010, 03:05 PM
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That's a 289/302 block, but with the plugs you pulled out could easily mean you have 351W heads on it. Popular swap before the big aftermarket head explosion on the early '90s.
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