302 to 351 swap - Mustang Evolution

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Old 01-21-2012, 04:41 PM   #1
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302 to 351 swap

I'm looking to get a new engine and LRS has the 302 roller for 799 and the 351 for 999 so my question would be. Besides the oil pan what other mods would I have to make to do the swap? ( dumb question ) and is it worth it ?
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Old 01-21-2012, 07:37 PM   #2
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Re: 302 to 351 swap

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I'm looking to get a new engine and LRS has the 302 roller for 799 and the 351 for 999 so my question would be. Besides the oil pan what other mods would I have to make to do the swap? ( dumb question ) and is it worth it ?
H-e-l-l yes it's worth it.
Instant 49 cube increase for one thing, stronger block for another.......

P.S. The only dumb questions are the ones you never ask.


You will need:
Oil pan, pickup tube and dipstick.
Lower intake for a 351W to match your upper.
Headers for a 351W. (The 351W is one inch wider, which is why the lower intake, pan and headers don't fit.)
Harmonic balancer. (
The 351W requires a 28-inch/ounce unbalance.)
........there's an easier way......
Here's a link to a 351W Swap article.
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Old 01-21-2012, 08:23 PM   #3
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Well worth it! My brother has a carbed 351w in his 91 coupe with a tko 500 behind it! Its a dream all the torque u need! Plus all u gotta do is swap the heads and put a good cam in it and you'll have the time of your life!
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Old 01-21-2012, 08:54 PM   #4
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Great now I'm stoked!!!!! Can't wait to get my taxes and drop that baby in. Thanks guys
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Old 01-21-2012, 11:37 PM   #5
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id be careful with those they are bored 30 to 60 over and sleeved.
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Old 01-21-2012, 11:52 PM   #6
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They are for N/A motors only!!!! No power adders !
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Old 01-22-2012, 12:30 AM   #7
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Re: 302 to 351 swap

The guys are correct. Good save you two.

I'm sorry, I was only thinking 302-351W swap and did not check out the engines you were talking about.


I'd leave those where they are and search for other options.
The cast pistons and possible sleeved cylinders might be fine for a stock daily beater, but I wouldn't want to build any power with them.
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Old 01-22-2012, 01:25 AM   #8
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I'd agree with that my brother got his from a full size bronco. Not sure what year. Some of the older vans had them also.
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Old 01-22-2012, 09:23 AM   #9
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Ok that's fine I just found a 351 on Craigslist I'm gonna try to go look at it later or tomorrow no to be able to identify the block what serial numbers am I looking for to make sure that's a block worth buying
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Old 01-22-2012, 01:03 PM   #10
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Re: 302 to 351 swap

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Ok that's fine I just found a 351 on Craigslist I'm gonna try to go look at it later or tomorrow no to be able to identify the block what serial numbers am I looking for to make sure that's a block worth buying
Here are some links with info on the 351W.


Ford Windsor Engines


A Reliable 500 HP
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Old 01-22-2012, 08:09 PM   #11
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Cool thanks
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Old 01-22-2012, 08:18 PM   #12
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Re: 302 to 351 swap

You want to find a 351w from 69-72, those are the best one's ford made. 69 has the highest nickel content out of the Windsor blocks and makes it incredibly strong. Can easily handle 500hp or more.
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Old 01-22-2012, 08:34 PM   #13
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So I gotta look for "doe" on the casting number according to the link Trojan posted
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Old 01-22-2012, 09:05 PM   #14
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Re: 302 to 351 swap

C9oe would be the best choice
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Old 01-22-2012, 09:08 PM   #15
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Re: 302 to 351 swap

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So I gotta look for "doe" on the casting number according to the link Trojan posted
C9 = 1969
D0 = 1970 (Note: That is a Zero after the D.)


Most likely it will be difficult if not impossible to find a good block from that era.
A new model block will serve as well, just put the main girdle support and maybe the valley girdle support as well on them to further strengthen the block.
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Old 01-22-2012, 09:29 PM   #16
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Lol I thought it was an o thanks for clearing that up. I most likely won't run any power adders for a while but I will look into strengthening the block so if I decide too go that route ill be fine thanks again for the help
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Old 01-22-2012, 09:33 PM   #17
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Ether that or give dart a call and see what one of there street heat 351 based blocks will run u.
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Old 01-22-2012, 09:41 PM   #18
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I sure will I'm open to any suggestions
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Old 01-22-2012, 11:10 PM   #19
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Do u have a game plan for what upgrades u want to do (blown vs n/a) or a goal hp u want to get out of it. This will help in choosing what block to go with. If ur looking for 500 or less a late model block can be picked up cheep and modded to make that fairlly reliable if ur planing on forced induction later on going with a more expencive dart block can save u some big head achs later on and determaning how much boost u wanna run is going to determan what level of dart block to go with (of course if u come accross a block between c9- d3 u still might get it cheep if the owner dosent know what he/she has and u wont need to do to much in the "streangthaning" department) how ever finding one will be the problem so call dart and start inquiring but b4 u do have a goal in mind because the sell about every level of block u can think of.
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Old 01-22-2012, 11:22 PM   #20
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Well I am still undecided but as far as doing a 351 swap it would be N/A with a cam and a good set of heads.

Im also looking at stroker kits a 331 or 347 N/A . Also a 306 supercharged so honestly I'm not sure what to get my goal would be under 500 and reliable as this is my dd
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Old 01-23-2012, 12:54 AM   #21
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Quote:
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Well I am still undecided but as far as doing a 351 swap it would be N/A with a cam and a good set of heads.

Im also looking at stroker kits a 331 or 347 N/A . Also a 306 supercharged so honestly I'm not sure what to get my goal would be under 500 and reliable as this is my dd
If it was me then id pick up a used late model 351w and do a 408 stroker twisted wedge heads and a f-303 cam (just incase i decided to throw a novi 1000 or something like that on it later but i would only run about 5lbs boost) that should get u right around where u want to be b4 the blower and a bit over where u want to be with the blower just know a few months down the road if u wanted more out of it ud need a new dart block or older 351w block so u can pump more boost pressure in it. Now there is a girddle support u can buy for late model blocks but truthfully speaking the dart blocks are way stronger so if u think u might want to dial up over 600+ hp then dont scrimp out just start with the good block. But like i said around 500hp is pretty do able reliabley in even a late model 351w just remember if big boost is what u think ull do then get a good block not a late model block. N/a dd 500est hp 408 stroker late model block should be ok and prolly your cheepest bet.
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Old 01-23-2012, 09:09 AM   #22
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The other reason why I'm undecided there's a 88 saleen for sale so that dosent help me decide lol
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Old 01-23-2012, 09:26 AM   #23
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Re: 302 to 351 swap

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The other reason why I'm undecided there's a 88 saleen for sale so that dosent help me decide lol


Buy the Saleen.
Put it in a garage and let it appreciate in value.
Save more money after the Saleen is paid for, then build your engine.


Don't forget the Ford Boss 302 & Boss 351 blocks if you are looking for a stronger block. They will hold up to around 1500 HP and they are cheaper than other aftermarket blocks.


351 Boss Block Article
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Old 01-23-2012, 09:31 AM   #24
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Yeah thats what I was thinking he wants 4500 obo so I gotta go check it out and work on the obo its a convertible
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