383 want bigger TBI - The 1947 - Present Chevrolet & GMC Truck Message Board Network

stevejohnson48 · 08-02-2011, 11:41 AM

In changing over to the 383

,in my 90 K1500,is there any chance of bolting up a TBI from a big block on the 350 intake

,other concerns are what computer modifications

if any? can I do for this conversion

scotts62 · 09-15-2011, 03:47 AM

Moved out of "projects and builds so you can get some replies.

BigBlocksRule · 09-15-2011, 08:08 AM

The intake will need to be bored/hogged out, otherwise the big block TBI will hang over the edges and create a helluva ledge for the incoming charge to try to get past.

benoit454 · 09-15-2011, 02:02 PM

why bother with that intake?

buy a 4bbl intake and an adapter plate and make that work, I hear the single plane high rise style are the best for tbi setups.

You can use a big block tbi and you can get bigger injectors and have the computer tuned/flashed or chips burnt for it.

As for fuel then an adjustable pressure reg. would help as well as an in tank tpi camaro fuel pump upgrade.

FritzA · 09-17-2011, 07:20 PM

Check out the eBay store for extreme EFI They bore out the 350 tbi to 50mm from stock 44. Not only will it be bigger bores but it will also have better bushings for the butterfly shafts and some airflow mods too. They also sell the sbc manifold bored out to 50mm and gaskets to match.

FritzA · 09-17-2011, 07:26 PM

You will also need to put in a better fuel pump (AC Delco 241 or 281 I can't remember) and an 18 pound regulator spring.

08-02-2011, 11:41 AM	#1
stevejohnson48 Registered User Join Date: Jul 2011 Location: El dorado Sprgs. Mo. Posts: 137	383 want bigger TBI In changing over to the 383,in my 90 K1500,is there any chance of bolting up a TBI from a big block on the 350 intake,other concerns are what computer modifications if any? can I do for this conversion

09-15-2011, 03:47 AM	#2
scotts62 One day... Join Date: Apr 2008 Location: Tuttle, Ok Posts: 9,240	Re: 383 want bigger TBI Moved out of "projects and builds so you can get some replies. __________________ Scott 93 crew cab build Project 62

09-15-2011, 08:08 AM	#3
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: 383 want bigger TBI The intake will need to be bored/hogged out, otherwise the big block TBI will hang over the edges and create a helluva ledge for the incoming charge to try to get past.

09-15-2011, 02:02 PM	#4
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: 383 want bigger TBI why bother with that intake? buy a 4bbl intake and an adapter plate and make that work, I hear the single plane high rise style are the best for tbi setups. You can use a big block tbi and you can get bigger injectors and have the computer tuned/flashed or chips burnt for it. As for fuel then an adjustable pressure reg. would help as well as an in tank tpi camaro fuel pump upgrade. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

09-17-2011, 07:20 PM	#5
FritzA Registered User Join Date: Jul 2009 Location: Denver Burbs, CO Posts: 115	Re: 383 want bigger TBI Check out the eBay store for extreme EFI They bore out the 350 tbi to 50mm from stock 44. Not only will it be bigger bores but it will also have better bushings for the butterfly shafts and some airflow mods too. They also sell the sbc manifold bored out to 50mm and gaskets to match.

09-17-2011, 07:26 PM	#6
FritzA Registered User Join Date: Jul 2009 Location: Denver Burbs, CO Posts: 115	Re: 383 want bigger TBI You will also need to put in a better fuel pump (AC Delco 241 or 281 I can't remember) and an 18 pound regulator spring.



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