TBI in our trucks - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Solver · 12-17-2002, 12:57 AM

I got a 1991 4x4 4.3 blazer for a really low price cause it was hit in right front. Has anyone put a 4.3 in our trucks with all the computer and wires? Will a 4.3 pull our trucks?
Or is there a way to dumb the engine with an older intake and regular carb? (would prefer this for ease of installation)
Did they make a 4.3 with regular carb?
What would I use for a distributor ( Year)?
Sorry about all the questions but I'm v6 illiterate.
Any info from the motorheads on here would be appreciated.

70c10 · 12-17-2002, 08:55 AM

I don't think you would be happy with 160 horsepower in a 4000 pound truck. That's my opinion.

lofly'a · 12-17-2002, 09:08 AM

i agree with 70c10 on the power issue, it would be a slug. you can find an intake and carb it, and you'd have to throw in an hei distributor too. "if" you're gonna do it, buy the literature that explains how to hook up the ecm (computer) and use the tbi. to go and hunt down the necessary parts to change over everything would be cost prohibitive and tedious cuz not many were made and the aftermarket parts are expensive. good luck

lukecp · 12-17-2002, 10:27 AM

Actually, the 350 in '72 was rated at 175 net horsepower. That is only 15 more than the 4.3. It isn't gonna be very fast, but the 4.3 is a good, reliable motor that gets decent MPG. Edelbrock makes intake manifolds and camshaft for it. Painless wiring has a wiring harness to retrofit a TBI motor into a older vehicle. However, for the money spent, why not just but a TBI 350 in the truck?

Tynee · 12-19-2002, 03:31 AM

I'm kinda with 70c10. I understand that the 30 was much better in '72, but I had a 4.3 in a full size '88 and hated every minute of it. Still wish I had that ruck back, but only 'cuz it was my first car.

12-17-2002, 12:57 AM	#1
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	TBI in our trucks I got a 1991 4x4 4.3 blazer for a really low price cause it was hit in right front. Has anyone put a 4.3 in our trucks with all the computer and wires? Will a 4.3 pull our trucks? Or is there a way to dumb the engine with an older intake and regular carb? (would prefer this for ease of installation) Did they make a 4.3 with regular carb? What would I use for a distributor ( Year)? Sorry about all the questions but I'm v6 illiterate. Any info from the motorheads on here would be appreciated. __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

12-17-2002, 08:55 AM	#2
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	I don't think you would be happy with 160 horsepower in a 4000 pound truck. That's my opinion. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

12-17-2002, 09:08 AM	#3
lofly'a Registered User Join Date: May 2000 Location: Alexandria, LA 71301 Posts: 1,451	i agree with 70c10 on the power issue, it would be a slug. you can find an intake and carb it, and you'd have to throw in an hei distributor too. "if" you're gonna do it, buy the literature that explains how to hook up the ecm (computer) and use the tbi. to go and hunt down the necessary parts to change over everything would be cost prohibitive and tedious cuz not many were made and the aftermarket parts are expensive. good luck __________________ -02 avalanche (daily driver) -66 gto ragtop 389/400 (garage queen, hand-me-down from dad) -72 Tribute Trans Am (6.0LS/T56 6-speed) in progress -2003 YUKON (Wife's) -71 gmc swb fleet (current project, gonna shave everything, bags, stuff w/ 20's, gen III powertrain) -48 3100 SWB - 12/31/23 LONG TERM Project

12-17-2002, 10:27 AM	#4
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	Actually, the 350 in '72 was rated at 175 net horsepower. That is only 15 more than the 4.3. It isn't gonna be very fast, but the 4.3 is a good, reliable motor that gets decent MPG. Edelbrock makes intake manifolds and camshaft for it. Painless wiring has a wiring harness to retrofit a TBI motor into a older vehicle. However, for the money spent, why not just but a TBI 350 in the truck? __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

12-19-2002, 03:31 AM	#5
Tynee I miss this truck. Join Date: Dec 2001 Location: Lexington, KY U.S.A. Posts: 2,863	I'm kinda with 70c10. I understand that the 30 was much better in '72, but I had a 4.3 in a full size '88 and hated every minute of it. Still wish I had that ruck back, but only 'cuz it was my first car. __________________ '07 GMC Acadia SLT. Sweet ride. '08 Crew Cab Z-71 short bed. Really like this truck A LOT.



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