i6 to 350 swap need help

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jairie laplante

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Mar 5, 2020
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Location
canada
First Name
jairie
Truck Year
1981
Truck Model
c10
Engine Size
250
i have a 1981 with the 250 i6 and i want to swap to a 350. i have been able to find that the motor mounts work the same but cant seem to find if my transmission will just bolt up to the 350. i have the 3 speed manual Saginaw transmission and want to keep it. so my question is what will i need to do to make the engine work with that transmission.
 

crpntr78

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Location
Missouri
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Jerry
Truck Year
86
Truck Model
K10
Engine Size
350
It will bolt right up. Did it on my 84.
 

jjester6000

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Illinois
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Jack
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1974
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C1500
Engine Size
250
i have a 1981 with the 250 i6 and i want to swap to a 350. i have been able to find that the motor mounts work the same but cant seem to find if my transmission will just bolt up to the 350. i have the 3 speed manual Saginaw transmission and want to keep it. so my question is what will i need to do to make the engine work with that transmission.

Yea, you literially need nothing extra to get it to bolt it up. If you are using an engine from '86 or later, though, you will need a different flywheel since they use a different crank flange.
 

jairie laplante

Junior Member
Joined
Mar 5, 2020
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9
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Location
canada
First Name
jairie
Truck Year
1981
Truck Model
c10
Engine Size
250
Yea, you literially need nothing extra to get it to bolt it up. If you are using an engine from '86 or later, though, you will need a different flywheel since they use a different crank flange.
thanks
 

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