2.8 to 350 swap

jaycliff · 07-23-2008, 01:34 AM

i was wondering if anyone knew about swaping out a 2.8 in my blazer to a 350 i herd about it being done but cant find any info about it any bit of information would be very helpfull a friend has told me he would give me a 350 out of a 73 full size pickup if i want to swap it out but i need to know 1 if it is posible to put a 350 in the space and if i would have to change gears in the rear end if it could go in the blazer and if it will work with the trans thats is in the blazer and 2 if would be worth to work and money to do the swap opposed to getting a blazer with a 4.3 in it anyway if anyone could help i thank you the blazer is my 83 chevy S10 blazer

junior3382 · 07-23-2008, 05:44 AM

Welcome....
Well, do not quote me, but I am almost for sure that the 5.7 will not line up to your transmission. If you had the 4.3 it would. So you may need the tranny too. As far as will it fit in the engine compartment? Well, anything is possible. The motor mounts will not line up so there will be some fabbing to do. it could be a fun project for sure.... but do not expect it to be easy....

As for the gears, you may need to change them, depends what you plan to use the motor for. If you are going utilize the power of a 350, then you may need a whole new rear end. You will definitely need to replace shocks and the drive shaft to compensate.... I am sure you will find even more stuff that needs looked at.... If you are just looking for a little more power though.... perhaps finding a blazer with a 4.3l would be the less expensive way to go. A little yes fun, but more practical. IMO.

jaycliff · 07-23-2008, 09:09 AM

what about tring to rebuild the 2.8 it has a slight knock just before it shifts into the next gear thats why i am looking for a new power source and the 350 is had to beat at free i just dont know if it is just wore out but it seems as if the 2.8 has no power at all

junior3382 · 07-23-2008, 09:18 AM

it would cost less to install a used or rebuilt 2.8 from a bone yard then trying to rebuild that motor. Depending on what is wrong of course, but it sounds like the motor is done.... If the 350 is free, can you get the tranny with it?

jaycliff · 07-23-2008, 09:19 AM

the trany that is has on it now is a 2 wheel drive 3 speed

jaycliff · 07-23-2008, 09:20 AM

the 350s trany

junior3382 · 07-23-2008, 09:41 AM

Are you in a position to get a new vehicle? Perhaps making a trade with the 350 for a 2.8l.... Not my first choice but may still be free. I just see the amount of work you will need to do to make the swap compatible, harness, ECU, mounts, tranny and mounts, exhaust, cutting, fabbing.... just seems to beg the question, is this Blazer in good enough shape, no rust and stuff, to warrant this kind of a project? I would figure a used motor would run ya about 300 bucks or so, and there would be a lot less of a headache to install it. Just what I am thinking though.

jaycliff · 07-23-2008, 10:07 AM

ok i see where you are going things i never thought of was alwas led to belive an old 350 only needs a few things to run didnt think about all the things in the blazer already as far as the blazer body is realy sound has 2 rust holes about the size of a half sheet of paper right behind the door on both sides i am always looking for a different vehical just dont want to be forced to have to buy one i dont know how long this one will hold out though but from what i have learned there seems to be a lot of work more then i would like i was thinking a saturday afternoon swap and out on the trail on sunday

junior3382 · 07-23-2008, 10:13 AM

Wow, a single day conversion and a next day test run.... How many guys are involved???...LOL... J/K I am not saying it cannot be done, just that it might be a bit more then you bargained for....

jaycliff · 07-23-2008, 10:21 AM

it would have been 3 guys both the guys willing to help have wrked on there trucks but they were old late 70 early 80 modle trucks real simple i guess i was hoping to get by with very minimal money spent but if it is that much work then that means money i think it would be in my best intrest to stick to my 65 thats a project i dont mind putting a little bit of money into thanks a lot for the advice realy opened my eyes to a lot of dark spot i never thought of glad i got on here before i got too deep

07-23-2008, 01:34 AM	#1
jaycliff Junior Member Join Date: Jul 2008 Location: tennesse Posts: 7	2.8 to 350 swap i was wondering if anyone knew about swaping out a 2.8 in my blazer to a 350 i herd about it being done but cant find any info about it any bit of information would be very helpfull a friend has told me he would give me a 350 out of a 73 full size pickup if i want to swap it out but i need to know 1 if it is posible to put a 350 in the space and if i would have to change gears in the rear end if it could go in the blazer and if it will work with the trans thats is in the blazer and 2 if would be worth to work and money to do the swap opposed to getting a blazer with a 4.3 in it anyway if anyone could help i thank you the blazer is my 83 chevy S10 blazer

07-23-2008, 05:44 AM	#2
junior3382 Senior Member Join Date: Mar 2007 Location: Currently, I live in Lancaster county, Pennsylvania. Posts: 3,040	Welcome.... Well, do not quote me, but I am almost for sure that the 5.7 will not line up to your transmission. If you had the 4.3 it would. So you may need the tranny too. As far as will it fit in the engine compartment? Well, anything is possible. The motor mounts will not line up so there will be some fabbing to do. it could be a fun project for sure.... but do not expect it to be easy.... As for the gears, you may need to change them, depends what you plan to use the motor for. If you are going utilize the power of a 350, then you may need a whole new rear end. You will definitely need to replace shocks and the drive shaft to compensate.... I am sure you will find even more stuff that needs looked at.... If you are just looking for a little more power though.... perhaps finding a blazer with a 4.3l would be the less expensive way to go. A little yes fun, but more practical. IMO. __________________ *Parts have been found, tools are collecting, tensions are rising, the weather is changing...look out.... the SAS is comming!*

07-23-2008, 09:18 AM	#4
junior3382 Senior Member Join Date: Mar 2007 Location: Currently, I live in Lancaster county, Pennsylvania. Posts: 3,040	it would cost less to install a used or rebuilt 2.8 from a bone yard then trying to rebuild that motor. Depending on what is wrong of course, but it sounds like the motor is done.... If the 350 is free, can you get the tranny with it? __________________ *Parts have been found, tools are collecting, tensions are rising, the weather is changing...look out.... the SAS is comming!*

07-23-2008, 09:41 AM	#7
junior3382 Senior Member Join Date: Mar 2007 Location: Currently, I live in Lancaster county, Pennsylvania. Posts: 3,040	Are you in a position to get a new vehicle? Perhaps making a trade with the 350 for a 2.8l.... Not my first choice but may still be free. I just see the amount of work you will need to do to make the swap compatible, harness, ECU, mounts, tranny and mounts, exhaust, cutting, fabbing.... just seems to beg the question, is this Blazer in good enough shape, no rust and stuff, to warrant this kind of a project? I would figure a used motor would run ya about 300 bucks or so, and there would be a lot less of a headache to install it. Just what I am thinking though. __________________ *Parts have been found, tools are collecting, tensions are rising, the weather is changing...look out.... the SAS is comming!*

07-23-2008, 10:13 AM	#9
junior3382 Senior Member Join Date: Mar 2007 Location: Currently, I live in Lancaster county, Pennsylvania. Posts: 3,040	Wow, a single day conversion and a next day test run.... How many guys are involved???...LOL... J/K I am not saying it cannot be done, just that it might be a bit more then you bargained for.... __________________ *Parts have been found, tools are collecting, tensions are rising, the weather is changing...look out.... the SAS is comming!*

07-23-2008, 09:09 AM	#3
jaycliff Junior Member Join Date: Jul 2008 Location: tennesse Posts: 7	what about tring to rebuild the 2.8 it has a slight knock just before it shifts into the next gear thats why i am looking for a new power source and the 350 is had to beat at free i just dont know if it is just wore out but it seems as if the 2.8 has no power at all

07-23-2008, 09:19 AM	#5
jaycliff Junior Member Join Date: Jul 2008 Location: tennesse Posts: 7	the trany that is has on it now is a 2 wheel drive 3 speed

07-23-2008, 09:20 AM	#6
jaycliff Junior Member Join Date: Jul 2008 Location: tennesse Posts: 7	the 350s trany

07-23-2008, 10:07 AM	#8
jaycliff Junior Member Join Date: Jul 2008 Location: tennesse Posts: 7	ok i see where you are going things i never thought of was alwas led to belive an old 350 only needs a few things to run didnt think about all the things in the blazer already as far as the blazer body is realy sound has 2 rust holes about the size of a half sheet of paper right behind the door on both sides i am always looking for a different vehical just dont want to be forced to have to buy one i dont know how long this one will hold out though but from what i have learned there seems to be a lot of work more then i would like i was thinking a saturday afternoon swap and out on the trail on sunday

07-23-2008, 10:21 AM	#10
jaycliff Junior Member Join Date: Jul 2008 Location: tennesse Posts: 7	it would have been 3 guys both the guys willing to help have wrked on there trucks but they were old late 70 early 80 modle trucks real simple i guess i was hoping to get by with very minimal money spent but if it is that much work then that means money i think it would be in my best intrest to stick to my 65 thats a project i dont mind putting a little bit of money into thanks a lot for the advice realy opened my eyes to a lot of dark spot i never thought of glad i got on here before i got too deep

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