Upgrading a 250ci to something larger.

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Old 11-01-2011, 12:36 AM
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Default Upgrading a 250ci to something larger.

I have a 75' with a 250ci in it. I am looking to upgrade to something larger. I was thinking that puting in a 350ci wont be to much of a headache but will still be worth my time. Has anyone else done this? Any comments or suggestions would be greatly appreaciated. Thanks
 
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Old 11-01-2011, 08:57 AM
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Yeah pretty simply change. Probably need frame and motor mounts. Also a exhaust system change and possibly a radiator if the 6 cyl. radiator doesn't cool enough. Of course new hoses, and cable to the carb too.
 
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Old 11-01-2011, 09:07 AM
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Last time I did the swap was in 84. I do not remember doing anything to the frame. We just got the V8 mounts and bolted them in. Althought the I6 tranny (if original) will not last long if you get a 350 with any real torque.
 
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Old 11-01-2011, 10:37 AM
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The exact same THM350 (M38) was used behind both the I6 and V8 engine, so you shouldn't have any issues with blasting your transmission, unless it's already on the way out.
 
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Old 11-02-2011, 07:10 PM
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Thank you guys. Mine does have the THM350 trans. Do you know what years of 350ci's will interchange with the tranny without having to mess with the bell housing?
 
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Old 11-02-2011, 07:11 PM
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Thank you.
 

Last edited by mittanclan; 11-02-2011 at 07:14 PM. Reason: double post
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Old 11-02-2011, 07:19 PM
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All 350's will work with your bellhousing.
 
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Old 11-08-2011, 04:59 PM
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yeah u can hook up any sbc including the 406 chevy that would be even better,good luck with ur v8 swap any choice u make is about the same work,not much to it,plus im sure u will enjoy the extra power.have fun and be safe out there.
 
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