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Old 12-23-2011, 04:56 PM
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Swap questions between carb'd and TBI engines

Howdy all. I have a 93 GMC 2WD pickup that I pulled the engine a while ago to rebuild. Well, I'm now putting together a TBI 383 for it, but haven't finished getting all the parts I need for it let alone find the time to build it. I've been looking for another TBI engine to put in in its place for the time being when a friend of mine gave me a decent running 350. The only issue is, it's a mid 70-early 80s carb'd 350 with a 2 piece main seal, non-roller cam, perimeter bot valve covers, etc. I know this engine would physically fit in my truck, but would it work if I swapped on the TBI intake and related parts? Since the truck was originally a 350 TBI, I'm thinking the computer would be okay with another 350, but are there sensors and things that wouldn't work right? Is this just not a swap that should happen or should it be okay? I was going to be running headers on the 383, so I could use those on the 350 then just transfer them over to the 383 when it's done. Oh, the trans is a rebuilt and beefed up 4L60e in case it matters.

Sooooooo, would this work for a temporary engine or is there too many differences between the old and new(er) engines?

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Old 12-24-2011, 06:31 PM
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The swap.

Your late model injection manifold was designed for the vortec heads. They are different than the earlier carb heads. If you want to spend a lot of money in converting parts you could make it happen but the quick answer, budget wise, is no. Don't go there.
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Old 12-24-2011, 06:55 PM
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Actually, my truck is a 93, so it's Pre-vortec. Vortec heads weren't put on trucks until 96. I plan on running a Performer TBI intake as well.
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Old 12-24-2011, 07:05 PM
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Vortec heads.

I guess I misunderstood. I thought you indicated that your valve covers were center bolt as opposed to perimeter. If you have valve covers with perimeter bolts, the swap should work.
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Old 12-24-2011, 07:59 PM
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Swirl port tbi heads are also center bolt. As long as the ports and bolt holes on your tbi
intake match up to the heads on your swap motor, you should be fine. If not, what about swapping heads as well? Swapping the heads onto the new motor won't take much longer than just the intake and then you know you won't have any compatibility issues
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Old 12-24-2011, 08:07 PM
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You're correct. I have center bolt valve covers, but the old style heads/intake bolt pattern. My truck had the swirl port heads and I bought the TBI Performer intake for the earlier bolt pattern heads, not the Vortec bolt pattern. I was building the 383 for torque, so I wasn't going to use the Vortecs.

So, my TBI intake and parts would bolt right onto the earlier engine and it should work okay with the original computer since it was for a 350, correct?

Thanks guys!
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Old 12-25-2011, 02:52 PM
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Quote:
Originally Posted by imacarfan2
You're correct. I have center bolt valve covers, but the old style heads/intake bolt pattern. My truck had the swirl port heads and I bought the TBI Performer intake for the earlier bolt pattern heads, not the Vortec bolt pattern. I was building the 383 for torque, so I wasn't going to use the Vortecs.

So, my TBI intake and parts would bolt right onto the earlier engine and it should work okay with the original computer since it was for a 350, correct?

Thanks guys!
I would go here www.fullsize.com But I think you need to make sure the heads cam distributor will work. Also the flex plate! Should be simple to check before you make the swap!!
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Old 01-03-2012, 06:33 AM
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Quote:
Originally Posted by imacarfan2
You're correct. I have center bolt valve covers, but the old style heads/intake bolt pattern. My truck had the swirl port heads and I bought the TBI Performer intake for the earlier bolt pattern heads, not the Vortec bolt pattern. I was building the 383 for torque, so I wasn't going to use the Vortecs.

So, my TBI intake and parts would bolt right onto the earlier engine and it should work okay with the original computer since it was for a 350, correct?

Thanks guys!
You could buy a TBI to carb intake adapter... drop in distributor... knock sensor in a hole on block into a water jacket... Coolant temp sensor near thermastat... That pretty much covers it!
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Old 02-03-2012, 06:23 PM
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CraigsClassics

You will also need to install a bung in the header collector for an 0-2 sensor...recommend on passengers side...easy to do....the computer will need to read that for the TBI for run correctly.
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