anybody running 4.3 motor swaps - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dragn91 · 06-29-2011, 09:00 PM

Was thinking of dropping a 4.3 vortec in my 63 burban was wondering if anyone has done this swap before. And what's your guys thoughts on the trans 5speed 700r or 350 turbo? It will be daily driven and I will probly tow a small trailer once in a wile
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66redw/white · 06-29-2011, 09:53 PM

fuel injection?

dragn91 · 06-29-2011, 10:16 PM

Was thinking stock fuel system or just new intake/ carb
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66redw/white · 06-30-2011, 01:09 AM

do you already have the motor?

not that i want to change your mind or anything but me personally if i was gonna swap in a fuel injected motor but didnt want to break the bank i would do a 4.8. the 4.3 doesnt really have that much power and doesnt get very good gas mileage either. my 4.3 is full bolt ons plus cam. dynoed just under 180hp to the tires. gets 16 mpg in the city and 22 on the high way. my 5.3 sierra has at least 40-50 more hp and gets 17 and 23 respectively. 4.8s can easily be carbed as well. although depending on how you did it you may have people askin if its a 305 v6.

either way

dragn91 · 06-30-2011, 08:38 AM

Yea I can get a vortec 4.3 with 30k miles free that's why I was thinking of it they put them in astro vans and they have to weigh near what the Burb weighs.
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61_FL_Apache · 06-30-2011, 08:59 AM

the 4.3 is a sweet V6 with plenty of power. Do you have the tranny too? It might be wise to have that original combo and adapt from there where needed.

My last Astro was a 2000 and I pulled a 21ft travel trailer with it and it has plenty of power.

dragn91 · 06-30-2011, 10:20 AM

No I don't have the trans I do have a 350 turbo short tail but id rather go 700r or 5 speed for highway cruzing
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61_FL_Apache · 06-30-2011, 10:24 AM

Id prefer the 700r4 for the highway. What gear is in the rear?

dragn91 · 06-30-2011, 11:29 AM

No clue but its screaming doing 55 how can you tell what gear it is without tearing it apart
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66redw/white · 06-30-2011, 05:53 PM

jack up the rear end and rotate the tire. the ratio is figured out by how ever many times the drive shaft turns in relation to how many times the tire turns. ex. one full tire rotation the drive shaft fully rotates 3 and a 3/4 times. id bet 3.73

posi unit rear ends need 1 tire rotation. non posi(open) need 2 tire rotations with one tire on the ground.

dragn91 · 06-30-2011, 06:44 PM

Ok and a posi will spin both tires the same way correct? I haven't even had a chance to look at it since I've had it and I always just did a burnout to figure it out lol
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06-29-2011, 09:00 PM	#1
dragn91 Registered User Join Date: Aug 2007 Location: charlestown maryland Posts: 272	anybody running 4.3 motor swaps Was thinking of dropping a 4.3 vortec in my 63 burban was wondering if anyone has done this swap before. And what's your guys thoughts on the trans 5speed 700r or 350 turbo? It will be daily driven and I will probly tow a small trailer once in a wile Posted via Mobile Device

06-29-2011, 09:53 PM	#2
66redw/white made in america Join Date: May 2010 Location: baton rouge la Posts: 653	Re: anybody running 4.3 motor swaps fuel injection? __________________ 2005 gmc sierra- 4/6, t56, cammed 5.3. 4.10, big bars, and brakes. sounds good 1964 c10-283 powerpack, 3 on the tree 2004 corvette- lowered, borla, tuned. slow my old girl 1966 c10- 305v8, t-5 sold

06-29-2011, 10:16 PM	#3
dragn91 Registered User Join Date: Aug 2007 Location: charlestown maryland Posts: 272	Re: anybody running 4.3 motor swaps Was thinking stock fuel system or just new intake/ carb Posted via Mobile Device

06-30-2011, 01:09 AM	#4
66redw/white made in america Join Date: May 2010 Location: baton rouge la Posts: 653	Re: anybody running 4.3 motor swaps do you already have the motor? not that i want to change your mind or anything but me personally if i was gonna swap in a fuel injected motor but didnt want to break the bank i would do a 4.8. the 4.3 doesnt really have that much power and doesnt get very good gas mileage either. my 4.3 is full bolt ons plus cam. dynoed just under 180hp to the tires. gets 16 mpg in the city and 22 on the high way. my 5.3 sierra has at least 40-50 more hp and gets 17 and 23 respectively. 4.8s can easily be carbed as well. although depending on how you did it you may have people askin if its a 305 v6. either way __________________ 2005 gmc sierra- 4/6, t56, cammed 5.3. 4.10, big bars, and brakes. sounds good 1964 c10-283 powerpack, 3 on the tree 2004 corvette- lowered, borla, tuned. slow my old girl 1966 c10- 305v8, t-5 sold

06-30-2011, 08:38 AM	#5
dragn91 Registered User Join Date: Aug 2007 Location: charlestown maryland Posts: 272	Re: anybody running 4.3 motor swaps Yea I can get a vortec 4.3 with 30k miles free that's why I was thinking of it they put them in astro vans and they have to weigh near what the Burb weighs. Posted via Mobile Device

06-30-2011, 08:59 AM	#6
61_FL_Apache Who Me? Join Date: Sep 2010 Location: Royal Palm Beach, FL Posts: 4,067	Re: anybody running 4.3 motor swaps the 4.3 is a sweet V6 with plenty of power. Do you have the tranny too? It might be wise to have that original combo and adapt from there where needed. My last Astro was a 2000 and I pulled a 21ft travel trailer with it and it has plenty of power. __________________ Steve 1997 Tahoe LT 4D 2WD (DD) 2001 Blazer 4D 2WD 1961 Apache 10 (sold) 1965 C10 Stepper (sold)

06-30-2011, 10:20 AM	#7
dragn91 Registered User Join Date: Aug 2007 Location: charlestown maryland Posts: 272	Re: anybody running 4.3 motor swaps No I don't have the trans I do have a 350 turbo short tail but id rather go 700r or 5 speed for highway cruzing Posted via Mobile Device

06-30-2011, 10:24 AM	#8
61_FL_Apache Who Me? Join Date: Sep 2010 Location: Royal Palm Beach, FL Posts: 4,067	Re: anybody running 4.3 motor swaps Id prefer the 700r4 for the highway. What gear is in the rear? __________________ Steve 1997 Tahoe LT 4D 2WD (DD) 2001 Blazer 4D 2WD 1961 Apache 10 (sold) 1965 C10 Stepper (sold)

06-30-2011, 11:29 AM	#9
dragn91 Registered User Join Date: Aug 2007 Location: charlestown maryland Posts: 272	Re: anybody running 4.3 motor swaps No clue but its screaming doing 55 how can you tell what gear it is without tearing it apart Posted via Mobile Device

06-30-2011, 05:53 PM	#10
66redw/white made in america Join Date: May 2010 Location: baton rouge la Posts: 653	Re: anybody running 4.3 motor swaps jack up the rear end and rotate the tire. the ratio is figured out by how ever many times the drive shaft turns in relation to how many times the tire turns. ex. one full tire rotation the drive shaft fully rotates 3 and a 3/4 times. id bet 3.73 posi unit rear ends need 1 tire rotation. non posi(open) need 2 tire rotations with one tire on the ground. __________________ 2005 gmc sierra- 4/6, t56, cammed 5.3. 4.10, big bars, and brakes. sounds good 1964 c10-283 powerpack, 3 on the tree 2004 corvette- lowered, borla, tuned. slow my old girl 1966 c10- 305v8, t-5 sold

06-30-2011, 06:44 PM	#11
dragn91 Registered User Join Date: Aug 2007 Location: charlestown maryland Posts: 272	Re: anybody running 4.3 motor swaps Ok and a posi will spin both tires the same way correct? I haven't even had a chance to look at it since I've had it and I always just did a burnout to figure it out lol Posted via Mobile Device



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