250 to 350 conversion

[Chisholmcody]

I just have a few questions on what parts need to be changed.

The first one is the motor mounts. I did a quick little search and haven't found the answer to my question. Are the 250 motor mounts the same as the 350 ones. And if they are is the only thing I have to do is to move them to the v8 position on the frame?

The second question- when I buy the crate motor can I run the oil pan it comes with or do I have to change it.

The third question- is the wiring  harness the same?


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[zieg85]

Good questions, I've not done a 250 to 350 switch in my 84 yet.  The previous 1967-72 the engine frame mounts would work but not sure of the 73 on ups.  The throttle cable is different.  You will need a V-8 shroud and radiator.  The PS pump, hoses and brackets are all wrong for the V-8.  Wiring is minimal, may have to be lengthened but I think everything should be long enough.

[Chisholmcody]

for the throttle cable do i just buy one for a 78 truck with a 350?

[Irish_Alley]

for the throttle cable do i just buy one for a 78 truck with a 350?

that should do

[Chisholmcody]

Alright thanks for the info guys hopefully I can do the swap before the end if the year


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