4.3throttle body on a 250 six - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68 longbed · 10-24-2008, 02:29 PM

hey guys! I've got a 250 in a 72 sub with clifford 4 barrel manifold, lumport head,rv cam,and hedders and am thinking about using a throttle body off a 4.3. Was wondering if this would work and if any one has done this and if they could provide some info?

thanks in avance.

PanelDeland · 10-24-2008, 05:33 PM

You might try Blu72(I think that's the right member name.He has done a TBI on a 350 from factory parts.He might be able to get you pointed in the right direction.

68 longbed · 10-25-2008, 01:16 PM

Any one done a six cylibnder?

RJGeister · 10-25-2008, 10:09 PM

Haven't seen this swap on this site yet. I have seen that a few guys did this swap on the stovebolt.com site. Look under the 'HiPo' section. Several are under construction so you might pick up some tips. The screen name 'efi-diy' is really good with the ECM. He just dropped a new 4300 in a 51 Chevy truck.

68C15 · 10-25-2008, 10:50 PM

I had a 40 Plymouth sedan with a 57 chevy 235 bored .080 and an Isky cam. I did multiport injection with a clifford intake and all the stuff from a 94 F250 4.9 5speed.
anything is possible.

5150.4.67 · 10-26-2008, 01:48 AM

Anything is possible with just two things. Time and money. Megasquirt has a stand-alone computer that will run just about anything. It might be a little pricey, however. It just depends how crazy you want to get!

tdave00 · 10-26-2008, 03:04 AM

I have read that multi-port FI is tough on the inlines because of the siamese ports and firing order. Most people do TBI from what I have read.

I would love to see a write up on 235 multiport though.

BlueJeep · 10-26-2008, 09:49 AM

Do a google search for binder bulletin, there are a ton of guys who have done this with IH Scouts and had good luck with it. They are putting them in their IH inlines either with or without the electronic distributor, and it works great. The injectors and the ECM are really the only pieces that have to be closely matched to your engine, and since the GM inline is close to the 4.3 CID-wise, it should be fairly easy. There are hundreds of companies that can burn you a new PROM (chip) for the ECM, so that's easy too.

68 longbed · 10-26-2008, 06:29 PM

Thanks again guys for the help. I'll check those sites

**'68OrangeSunshine** · 10-26-2008, 07:12 PM

Check out www.inliners.org
A guy with the handfle, "efi-diy" has a few posts about similiar set-ups. Look on the "High-Performance" and "Forced Induction" forums there.

68 longbed · 10-30-2008, 12:44 PM

tried inliners.org , couldn't get the site to work.

what I'm Idoing wrong?

Brad · 10-30-2008, 01:07 PM

It's working fine for me right now, however it's an unreliable forum.

tdave00 · 10-30-2008, 10:23 PM

Quote:

Originally Posted by 68 longbed

tried inliners.org , couldn't get the site to work.

what I'm Idoing wrong?

Pretty much gave up on that site. They need to get with the times - Internet wise.

**'68OrangeSunshine** · 10-31-2008, 08:01 AM

I can bring it up, but I can't post on it. I called the webmaster, he was busy, about to haul out to Bonneville for the weekend. Something about my firewall blocking my posting. [?] I can understand priorities, but I pay dues to I/I.

hotrod 80 · 10-31-2008, 08:57 AM

I did a 4.3 tbi on a 258 AMC I-6 and it worked great.

TP from Cntl PA · 10-31-2008, 09:23 AM

I got a kit from Howell via Clifford for mine which uses a GM TBI unit/computer............Thing works awesome!

10-24-2008, 02:29 PM	#1
68 longbed Registered User Join Date: Jan 2007 Location: Elberta,Ala Posts: 77	4.3throttle body on a 250 six hey guys! I've got a 250 in a 72 sub with clifford 4 barrel manifold, lumport head,rv cam,and hedders and am thinking about using a throttle body off a 4.3. Was wondering if this would work and if any one has done this and if they could provide some info? thanks in avance.

10-24-2008, 05:33 PM	#2
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: 4.3throttle body on a 250 six You might try Blu72(I think that's the right member name.He has done a TBI on a 350 from factory parts.He might be able to get you pointed in the right direction. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

10-25-2008, 01:16 PM	#3
68 longbed Registered User Join Date: Jan 2007 Location: Elberta,Ala Posts: 77	Re: 4.3throttle body on a 250 six Any one done a six cylibnder?

10-25-2008, 10:09 PM	#4
RJGeister Retired Air Force 87-09 Join Date: Feb 2007 Location: Bonaire, Georgia 31005 Posts: 284	Re: 4.3throttle body on a 250 six Haven't seen this swap on this site yet. I have seen that a few guys did this swap on the stovebolt.com site. Look under the 'HiPo' section. Several are under construction so you might pick up some tips. The screen name 'efi-diy' is really good with the ECM. He just dropped a new 4300 in a 51 Chevy truck.

10-25-2008, 10:50 PM	#5
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	Re: 4.3throttle body on a 250 six I had a 40 Plymouth sedan with a 57 chevy 235 bored .080 and an Isky cam. I did multiport injection with a clifford intake and all the stuff from a 94 F250 4.9 5speed. anything is possible.

10-26-2008, 01:48 AM	#6
5150.4.67 Registered User Join Date: Dec 2007 Location: Modesto, Ca Posts: 411	Re: 4.3throttle body on a 250 six Anything is possible with just two things. Time and money. Megasquirt has a stand-alone computer that will run just about anything. It might be a little pricey, however. It just depends how crazy you want to get!

10-26-2008, 03:04 AM	#7
tdave00 Restoring a 68 SWB Join Date: Jan 2008 Location: Nashville, TN Posts: 1,068	Re: 4.3throttle body on a 250 six I have read that multi-port FI is tough on the inlines because of the siamese ports and firing order. Most people do TBI from what I have read. I would love to see a write up on 235 multiport though. __________________ My Build Thread: Lucy - My 1968 SWB - Shop Truck Style North Nashville Concrete Contractor Last edited by tdave00; 10-26-2008 at 03:05 AM.

10-26-2008, 09:49 AM	#8
BlueJeep Registered User Join Date: Mar 2008 Location: Waukee, Iowa Posts: 1,608	Re: 4.3throttle body on a 250 six Do a google search for binder bulletin, there are a ton of guys who have done this with IH Scouts and had good luck with it. They are putting them in their IH inlines either with or without the electronic distributor, and it works great. The injectors and the ECM are really the only pieces that have to be closely matched to your engine, and since the GM inline is close to the 4.3 CID-wise, it should be fairly easy. There are hundreds of companies that can burn you a new PROM (chip) for the ECM, so that's easy too. __________________ build threads: 86 Suburban 88 Jeep 6.0 swap 49 Chevy truck 54 Chevy wagon 86 Suburban lowered 4/6 54 Chevy wagon 49 Chevy/s10 mix 88 Jeep Wrangler rockcrawler

10-26-2008, 06:29 PM	#9
68 longbed Registered User Join Date: Jan 2007 Location: Elberta,Ala Posts: 77	Re: 4.3throttle body on a 250 six Thanks again guys for the help. I'll check those sites

10-26-2008, 07:12 PM	#10
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	Re: 4.3throttle body on a 250 six Check out www.inliners.org A guy with the handfle, "efi-diy" has a few posts about similiar set-ups. Look on the "High-Performance" and "Forced Induction" forums there. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

10-30-2008, 12:44 PM	#11
68 longbed Registered User Join Date: Jan 2007 Location: Elberta,Ala Posts: 77	Re: 4.3throttle body on a 250 six tried inliners.org , couldn't get the site to work. what I'm Idoing wrong?

10-30-2008, 01:07 PM	#12
Brad Out of the carpool lane. Join Date: Jan 2000 Location: Clark Co, WA Posts: 5,672	Re: 4.3throttle body on a 250 six It's working fine for me right now, however it's an unreliable forum. __________________ 1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...

10-31-2008, 08:01 AM	#14
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,504	Re: 4.3throttle body on a 250 six I can bring it up, but I can't post on it. I called the webmaster, he was busy, about to haul out to Bonneville for the weekend. Something about my firewall blocking my posting. [?] I can understand priorities, but I pay dues to I/I. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

10-31-2008, 08:57 AM	#15
hotrod 80 mini truck racer Join Date: Aug 2006 Location: Baytown , texas Posts: 3,010	Re: 4.3throttle body on a 250 six I did a 4.3 tbi on a 258 AMC I-6 and it worked great. __________________ 1949 5-window 1969 Camaro 1976 Chevy Luv yellow 1978 Chevy Luv Blue 1976 Chevy Luv Black 1979 Firebird Flooded in Harvey 1999 F350 Dually 2005 GMC Sierra 4.8 RCSB 2014 Explorer (wifes) My build :http://67-72chevytrucks.com/vboard/s...d.php?t=399148 Build #2: http://67-72chevytrucks.com/vboard/s...d.php?t=653583

10-31-2008, 09:23 AM	#16
TP from Cntl PA Registered User Join Date: Apr 2003 Location: Central PA....In the Berg of Nisbet Posts: 790	Re: 4.3throttle body on a 250 six I got a kit from Howell via Clifford for mine which uses a GM TBI unit/computer............Thing works awesome! __________________ '72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!!



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