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Hello,

What is needed to swap out a 351c for a 351w? I'm looking for anything that you'd have to change other than just the engine to make the swap. Lets say I had a running 351c in a car now and I have a 351w crate engine sitting next to it, what else do I need to do the swap? If it matters, it would be in a 70 Mustang.

Thanks for any help,
Kevin
 

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Sorry, couldn't help myself. I am not an expert but the following comes to mind.

>headers-different
>bellhousing bolt pattern-same
>radiator-different
>motor mounts-same

This is by no means a comprehensive list. I am sure others with more knowledge will be along shortly to offer real wisdom. Good luck.
 

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TommyK said:
Sorry, couldn't help myself. I am not an expert but the following comes to mind.

>headers-different
>bellhousing bolt pattern-same
>radiator-different
>motor mounts-same

This is by no means a comprehensive list. I am sure others with more knowledge will be along shortly to offer real wisdom. Good luck.
it might be diffrent in a 1970 but in a 1971-3 the radiator interchange! and youll need new radiator hoses and everthing else is interchangable ! good luck!
 

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I understand his position if he has a crate engine sitting there basically ready to lite up. If NOT,,,then i would build the Cleveland versus having to find a windsor and going through the dog and pony show to swap it out.Here's the deal,,,same trans,same flywheel(need to check the year/windsor for imbalance though),motor mounts bolt up the same way. On a 70,,the radiator will work fine,,a/c or no a/c. What you WILL need are all the correct pulleys for the 1970 and up dress,timing chain cover for 70-up.The fan will work fine though.May need a different aluminum spacer for the fan though. The exhaust is the major difference,,nothing bolts up the same between either engine. Either buy the new "H" pipe to fit whatever year exhaust manifolds you go with,,69 or 70 versions (they ARE different),or bolt on a new set of headers and have some exhaust shop hook them back up. Just my personal opinion,,,next to a big-block,,the Cleveland is a much better "eye-candy" engine under the hood of a 70 than any windsor. They breath a hell of a lot better too due to thier canted huge valves also.
 

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One thing to keep in mind -- the firewall to engine gauge wire harness feed will have to be changed (or at least modified). Different locations on the 351C versus the 351W for the Oil Pressure & Water Temperature sending units.
 

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One thing to keep in mind -- the firewall to engine gauge wire harness feed will have to be changed (or at least modified). Different locations on the 351C versus the 351W for the Oil Pressure & Water Temperature sending units.
Would you get the wire feed harness for a 70s model. i have a 67 coupe with 351c wondering which harness to get
 

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Dizzy, exhaust, accessories, depending on years...maybe flexplate/flywheel if the imbalance is different, valve covers, thermostat, upped radiator house
 

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If you need power steering, be sure to get the Windsor power steering pump and brackets. The 351C power steering pump pulley is different and so are the brackets. Windsor brackets and pulley won't align the belt properly on a Clevland. I imagine the reverse would be true. The 1970 Cleveland has unique power steering.
 

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Oddly, the 351C and 351W used the same flywheel, about the only thing they had in common.

Oh, and the 70 351C and 70 351W had the same radiator, they simply used different upper hoses.
 

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Actually, the 351w can be built to be a very nice engine. Why do you think they made clevors back in the day. Now you can buy lots of stuff to build windsors that will perform with clevelands. Boss 302 is a modified Windsor block also. Additionally, I understand that the bottom end and oiling system better on Windsor. Back in the day, clevelands were preferred because their heads were superior to windsors, but these days of aftermarket heads have pretty much equalized this advantage. Weak link was the heads, so most add on power was focused towards the Cleveland years ago.
 

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Hey there guys- check the date on the first 7 posts- more than 10 years old.

67coupe351c revived a 10 year old thread and all he is asking about is the engine wiring harness which Pete responded to.
 

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Lol did not look at that. Just saw someone call it a wheezer and stuck up 351w. 10 years ago, that kinda makes sense
 
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