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  • 1965 - 1973 Classic Mustangs -General/Talk-

Swapping My 250 To A 289?

  • Thread starter Thread starter Cbaker54
  • Start date Start date Dec 11, 2013

Cbaker54

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Dec 11, 2013
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Dec 11, 2013
#1
  • Dec 11, 2013
  • #1
I have a 1969 coupe and I'm planning to swap my 250 straight six with a 289 hipo soon, I'm having a hard time on trying to figure out what I'll have to replace in my car for it to work so if you have any information that can help that would be great thanks.
 

rbohm

Founding Member
Apr 12, 2002
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Dec 11, 2013
#2
  • Dec 11, 2013
  • #2
not much really. the 250 uses the same bell housing bolt pattern as the 289, so the V8 will bolt up to the transmission, and the rear end should be an 8" already, so no changes there. the transmission is already strong enough for the V8 so again no changes there. the front suspension is the same, including the spindles, though the springs may need to be upgraded to a stiffer set, i recommend the GT springs front and rear.

things that will need to be changed are;

the chassis mounts that the engine mounts bolt to
the radiator outlets depending on what water pump you use
and all the usual bits and pieces like wiring, linkage, fuel lines etc.
 

horse sence

15 Year Member
Nov 29, 1999
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Dec 11, 2013
#3
  • Dec 11, 2013
  • #3
make sure you by the 67 -70 frame brackets motor mounts .65-66 are different and the motor will not set on them correctly.
 

rbohm

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#4
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good point HS
 

Cbaker54

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Dec 11, 2013
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Dec 11, 2013
#5
  • Dec 11, 2013
  • #5
Thanks for the information, I guess it's not a normal thing to go from a 250 to a 289. I've been searching on what the differences are but everything was about converting to a 351.
 

horse sence

15 Year Member
Nov 29, 1999
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Wile Coyote's stunt double
Dec 11, 2013
#6
  • Dec 11, 2013
  • #6
289,302 and 351 are basically the same in the motor mounts .the 351 is taller and wider
 

rbohm

Founding Member
Apr 12, 2002
6,698
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tucson,az
Dec 11, 2013
#7
  • Dec 11, 2013
  • #7
Cbaker54 said:
Thanks for the information, I guess it's not a normal thing to go from a 250 to a 289. I've been searching on what the differences are but everything was about converting to a 351.
Click to expand...

actually swapping a six, any six, for a V8 tends to be the norm for most people. keeping the six and building it is being different. and the 250 can make for a really nice healthy street motor given a chance. let me know if you want ideas on building the six instead.
 
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