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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: DANZIG on March 26, 2010, 02:17:18 pm

Title: Straight six swap to Small block V 8
Post by: DANZIG on March 26, 2010, 02:17:18 pm

Got a '79 C 10  with a 250 straight six, 350 TH auto.  Looking to drop in a donor  '86  350 V8.
C 10 Donor also has a 350 TH auto.

What parts will I need for this swap?  Motor mounts, throttle cable,, ..........?

Title: Re: Straight six swap to Small block V 8
Post by: Blazin on March 26, 2010, 03:37:56 pm

Throttle cable yes.  Upper and lower radiator hoses, a V8 power steering pump bracket if it doesn't have one, bigger radiator wouldn't be a bad idea. I have made a I6 engine wire harness work but the V8 one fits a little better. Other than that it should drop right in. It will bolt to your existing TH 350 if you don't know much about the new one, and yours is good. Use the torque converter from the V8.

Title: Re: Straight six swap to Small block V 8
Post by: DANZIG on March 26, 2010, 05:00:27 pm

Wow, that's it?  Can it really be that easy?

How about the motor mounts?  Detent cable?  Any Trouble with transmission lines to the radiator?

Title: Re: Straight six swap to Small block V 8
Post by: Captkaos on March 31, 2010, 09:11:42 pm

You have to move the mounts bolted to the frame stands to the V8 position.  Trans lines should be ok, or can be made to fit.  Done this a number of times.  My truck I bought in 89 came with a 6, it has had a 350 and 454 in it, same harness.