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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 82chevy on June 15, 2008, 03:51:25 pm

Title: 350 to 454
Post by: 82chevy on June 15, 2008, 03:51:25 pm

hey guys i have some questions. i have a 82 chevy with a 350 that was already swapped to tbi. it raps pretty bad and its time for a new engine. i know someone with a 454 tbi that supposedly runs great. what do i need to get to swap this motor into my truck now. im guessing BBC motor mounts? but what else? any help will be great

Title: Re: 350 to 454
Post by: VileZambonie on June 15, 2008, 05:53:17 pm

The mounts are the same. The wiring harness and computer would be helpful. Flexplate, exhaust, radiator, hoses, pulleys etc. That's where you'll have to make some changes.

Title: Re: 350 to 454
Post by: dumbucket1 on June 15, 2008, 06:27:59 pm

I went backwards on a carbed truck, only had to have my existing exhaust hooked up to the 350 and had to put a small block power steering pump on. Everything else I reused from the 454.

Title: write-up
Post by: txtj79 on June 17, 2008, 08:58:34 pm

Does anyone know of a write up or more detailed description on doing this in one of our trucks?  I have a line on a good running 454, carbed, alreday mated to a TH400.

Thanks,

T.J.

Title: Re: 350 to 454
Post by: Captkaos on June 17, 2008, 11:59:06 pm

How detailed do you want?  It is just a matter of taking a SBC out and putting a BBC in, save for a few specifics.

Title: Re: 350 to 454
Post by: frogman68 on June 18, 2008, 02:27:22 am

If its 2wd wont the coils need to be swapped ??

Title: Re: 350 to 454
Post by: werewolfx13 on June 18, 2008, 07:58:02 am

ought to be so as to not affect the ride height and handling, course you can also install coil spring air helpers and use those...

Title: Re: 350 to 454
Post by: txtj79 on June 18, 2008, 10:20:54 am

Well, I don't really have any experience with big blocks.  I mainly would like to know what parts I would need to change out in order to make it work.  Or is Vile's list above pretty much it?

Thanks,

T.J.

Title: Re: 350 to 454
Post by: Captkaos on June 18, 2008, 10:57:23 am

Viles list is pretty much accurate.  If you have a complete running engine/trans assembly, you don't need to worry about the flexplate.  The exhaust is different.
As for coils, it will lower the truck about 1".

Title: Re: 350 to 454
Post by: ccz145a on June 18, 2008, 11:30:11 am

Quote

As for coils, it will lower the truck about 1".

If you keep the original coils, your alignment will change. I ruined a front set of tires after a 305 --> 396 swap and a 300mi drive.

The power streering bracket is the hardest thing to get.

Title: Re: 350 to 454
Post by: txtj79 on June 18, 2008, 12:05:46 pm

Ok, thanks guys.  I think I'm gonna jump on this.


-T.J.

Title: Re: 350 to 454
Post by: Captkaos on June 18, 2008, 04:24:03 pm

Start a new post with what you are doing and add some pics and you can create a how to on how to.