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Jafo216 · 08-31-2001, 10:02 PM

Hi , I have a 1989 Chevy 1500 2wd with a 4.3 v-6 and a four speed auto transmission . My question is I want to swap in a 305 or 350 . How much trouble is this and what all do I have to change out . I was told that my throttle body will bolt right up to the V-8 intake . Is this true . Any help will be greatly appreciated .

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1989 Chevy Silverado
4.3 v-6 Throttle body injected . Free flow Turbo exhaust system .
four speed auto .
86 Rally wheels 15x8
RED with Gray interior .
All original and in very good condition , like going back to 89 .

Z16 · 09-02-2001, 03:56 PM

This is basically a bolt in. The throttle body will bolt up and should flow the same as a 305(350 is a little bigger as I recall). I am not sure about the 700R4 transmission behind a V6 in a Full size, but the S10 one isn't strong enough to hold up to a V8 for any lenght of time. Other then that, all the accessories bolt up as the front of the 4.3 is the same as a V8. You will need a V8 shroud and radiator, and motor mounts. Easiest way is to find a complete wrecked truck and just move everything over.

Longhorn Man · 09-03-2001, 12:16 PM

The mounts may be the same, call a parts store and cross referance them. I would hesitate on the throttle body. The 4.2 is only 262 (ish) cubic inches.Your talking 40 cubes between the two motors. The easiest way is to put on a carb, the best way if you really want the injection, is to get one out of a wrecked truck. You may need the harness and puter too though.

Timbo's350 · 09-04-2001, 09:52 PM

longhornmail,
If he got higher flow injectors & thus a higher flow fuel pump would he still be able to use the throttle body??

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90 GMC Sierra SWB... TBI 350 w/ 700R4 (4L60) 98k mi. Flowtech Shorty Headers, Jet chip, Flows (Dualed at the corners of the fender), K&N Aircharger, Bosch Plat. +4 plugs & wires

2 RF 10" HE2 subs & RF 250a2 amp.... Kenwood 4x6s in dash & columns

"Beer, Boobs, or Booty... Nobody rides free"- A friend of mine

My Truck has only 2 speeds:
Reverse &
WHAT THE HELL WAS THAT!!
-My 10 yr. old bro_

08-31-2001, 10:02 PM	#1
Jafo216 Registered User Join Date: Aug 2001 Location: Howell County , Mo. Posts: 5	Engine Swap Hi , I have a 1989 Chevy 1500 2wd with a 4.3 v-6 and a four speed auto transmission . My question is I want to swap in a 305 or 350 . How much trouble is this and what all do I have to change out . I was told that my throttle body will bolt right up to the V-8 intake . Is this true . Any help will be greatly appreciated . ------------------ 1989 Chevy Silverado 4.3 v-6 Throttle body injected . Free flow Turbo exhaust system . four speed auto . 86 Rally wheels 15x8 RED with Gray interior . All original and in very good condition , like going back to 89 . __________________ 1989 Chevy Silverado 4.3 v-6 Throttle body injected . Free flow Turbo exhaust system . four speed auto . 86 Rally wheels 15x8 RED with Gray interior . All original and in very good condition , like going back to 89 .

09-02-2001, 03:56 PM	#2
Z16 Registered User Join Date: Mar 2001 Location: Medicine Hat, Alberta, Canada Posts: 1,508	This is basically a bolt in. The throttle body will bolt up and should flow the same as a 305(350 is a little bigger as I recall). I am not sure about the 700R4 transmission behind a V6 in a Full size, but the S10 one isn't strong enough to hold up to a V8 for any lenght of time. Other then that, all the accessories bolt up as the front of the 4.3 is the same as a V8. You will need a V8 shroud and radiator, and motor mounts. Easiest way is to find a complete wrecked truck and just move everything over. __________________ 98 GMC Sierra Ex Cab, cowl hood, Euro LED lights, 30 bar billet, Whipple Supercharged 350 Vortec: Forged flattops, E-Tec aluminum heads, Comp Cam, Scat crank and rods, Granatelli Mass air flow, Headers, Flowmaster exhaust , Complete MSD Ignition, Custom Tuning, intake spacer , ported throttle body, AC Delco port injection upgrade, Roller Rockers, Power Pulleys. Gear Vendors Overdrive. Soon to hit a dyno. 2/4 drop(for now). 95 Chevy S-10 Ex Cab 4.3 5 Speed 2/3 drop, Euro lights, billet grill, More to come. The Daily Driver

09-04-2001, 09:52 PM	#4
Timbo's350 Registered User Join Date: May 2001 Location: Humble, Tx, USA Posts: 125	longhornmail, If he got higher flow injectors & thus a higher flow fuel pump would he still be able to use the throttle body?? ------------------ 90 GMC Sierra SWB... TBI 350 w/ 700R4 (4L60) 98k mi. Flowtech Shorty Headers, Jet chip, Flows (Dualed at the corners of the fender), K&N Aircharger, Bosch Plat. +4 plugs & wires 2 RF 10" HE2 subs & RF 250a2 amp.... Kenwood 4x6s in dash & columns "Beer, Boobs, or Booty... Nobody rides free"- A friend of mine My Truck has only 2 speeds: Reverse & WHAT THE HELL WAS THAT!! -My 10 yr. old bro_ __________________ 90 GMC Sierra SWB... TBI 350 w/ 700R4 (4L60) 100k mi. Flowtech Shorty Headers, Jet chip, Flows (Dualed at the corners of the fender), K&N Aircharger, Bosch Plat. +4 plugs & wires 2 RF 10" HE2 subs & RF 250a2 amp.... Kenwood 4x6s in dash & columns, Pioneer CD Gray w/ a fat red stripe on either side, 16x8s w/ 255/70/15 Goodyear Wingfoot, Billet Grill... (Soon to be dropped 4/6 rollin on 255/55s at the corners, Chrome teardrop front bumper, Clear headlights, signals, & corners, phantom grill Cervinis Ram Air Hood, Sir Michael's Roll Pan, sport mirrors, caddy tails, shaved trim & emblems, tailgate handle,& doors)Haven't though of a color to paint it yet but I was thinking a blue or orange pearl w/ either racing stripes or ghost flames "Beer, Boobs, or Booty... Nobody rides free"- A friend of mine My Truck has only 2 speeds: Reverse & WHAT THE HELL WAS THAT!! -My 10 yr. old bro- FCK THOSE PUSY TERRORISTS GOD BLESS AMERICA!!!

09-03-2001, 12:16 PM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	The mounts may be the same, call a parts store and cross referance them. I would hesitate on the throttle body. The 4.2 is only 262 (ish) cubic inches.Your talking 40 cubes between the two motors. The easiest way is to put on a carb, the best way if you really want the injection, is to get one out of a wrecked truck. You may need the harness and puter too though.



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