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New engine mounts, exhaust system, PCM at the least. It shouldn’t be that difficult a swap as GM makes part interchangeability a priority!
[quote=”drivewaymechanic” post=115932]i have a 1992 chevy pickup with a stock 4.3l v6 that starting to smoke what would take to a 5.7l v8 in it ?[/quote]
On an old Chev like that it would not make sense to do a major engine upgrade like that because of the cost involved. Far less issues if you sell the vehicle and buy one with a V8 if it is a V8 you want. Otherwise just replace the V6 engine with exactly the same V6.
V8 upgrade will almost certainly require a change in the transmission and most likely the need for a replacement diff as well. Then you will need to check any issues with the front end specs related to and necessary for the 5.7 V8 fitment including front brakes and front suspension.
Major upgrades are fine if you are willing to throw lots of money at it – such as people do with full restorations – but I expect spending lots of cash is not what you plan on.
[quote=”cam0888″ post=115944][quote=”drivewaymechanic” post=115932]i have a 1992 chevy pickup with a stock 4.3l v6 that starting to smoke what would take to a 5.7l v8 in it ?[/quote]
On an old Chev like that it would not make sense to do a major engine upgrade like that because of the cost involved. Far less issues if you sell the vehicle and buy one with a V8 if it is a V8 you want. Otherwise just replace the V6 engine with exactly the same V6.
V8 upgrade will almost certainly require a change in the transmission and most likely the need for a replacement diff as well. Then you will need to check any issues with the front end specs related to and necessary for the 5.7 V8 fitment including front brakes and front suspension.[/quote] I disagree, the diff and the tranny should be adequate(assuming the diff is a 10 bolt, 14 bolt etc. rear and the tranny is a 4l60/700-R4). The suspension should be taken into consideration although I don’t believe it would be an issue. As long as you are doing the work yourself it shouldn’t be too costly an endeavor. Where are you acquiring this 5.7 and is it complete(harness, injectors, heads, pulleys, intake, etc etc.? If you go to a junkyard and find an identical truck, snag the pcm, engine(and all associated components), and anything else you might need. This is assuming you are doing the work yourself.
Chevy builds the same truck in most cases and part interchangeability makes Chevys the easiest and cheapest to work on. Your truck was designed to be able to accommodate a V8 in the bay(spacewise) because what sense would it be to make 3 different trucks for 3 different engines? My old Chevy can accommodate a diesel 6.2L if I so chose because it was offered and the truck was built with the space to accommodate it.EDIT: I forgot to mention the the 350(5.7L) and the 4.3L are essentially the same block, the 4.3L is just “missing” two cylinders. If I recall correctly the bore of the 4.3L’s individual cylinders is 4.00 whereas the 350s are slightly less(3.736). The block is the same for ease of manufacturing. Of course this is just from memory someone correct me if I’m wrong.
[quote=”cam0888″ post=115944]On an old Chev like that it would not make sense to do a major engine upgrade like that because of the cost involved. Far less issues if you sell the vehicle and buy one with a V8 if it is a V8 you want. Otherwise just replace the V6 engine with exactly the same V6.
V8 upgrade will almost certainly require a change in the transmission and most likely the need for a replacement diff as well. Then you will need to check any issues with the front end specs related to and necessary for the 5.7 V8 fitment including front brakes and front suspension.
Major upgrades are fine if you are willing to throw lots of money at it – such as people do with full restorations – but I expect spending lots of cash is not what you plan on.[/quote]
They produced well over 90 million small block chevrolet engines since 1955. A large majority of those engines could bolt right into that truck both at the mounts and directly at the transmission. The OP might have to move the frame side mounts forward into holes that will already be stamped into the crossmember from the factory. An LS engine could even be bolted into that truck and it would still fit the transmission directly. While not absolutely perfect, Chevy is awesome about interchangeability. The OP would want to have a complete donor truck to trade parts to and from because there will be parts that won’t swap over between the V6 and the V8. He’s got plenty of options to retrofit if he wants to ditch his PCM for a carburetor.
This shouldn’t be an expensive process either. Parts are everywhere which means parts are cheap. The popularity of the small block Chevy has given it so much aftermarket support, the Lego company even makes parts for them.
Replacement diff is not necessary unless he’s going to build the engine well above and beyond stock specs. Your most common stock 305’s and 350’s are only worth about 175-220ish horsepower in a lot of cases. (at least after certain fuel embargos and emissions laws anyway.) The front springs would probably need to be changed though. The stock springs will squat farther since they were only meant to hold up six cylinders instead of eight. The rest of the suspension and braking will be sufficient, if not identical, unless, once again, the OP is planning substantial power upgrades.
The entire exhaust may not be necessary. It might be enough to just have the V8 Y-pipe handy from the donor vehicle and it might bolt straight up to the rest of the original exhaust.
The 4.3 and the 5.7 both have 4.000″ bores. The 3.736″ bore should be the hole diameters for the 305’s.
@ the OP, do you know where your replacement engine is coming from? Knowing what to change is going to depend on the donor. Like I said, interchangeability is awesome, but not perfect. If you can find yourself a cheap donor truck of the same vintage, get the whole thing and just use it up as you need to.
[quote=”no_common_sense” post=115957][quote=”cam0888″ post=115944]On an old Chev like that it would not make sense to do a major engine upgrade like that because of the cost involved. Far less issues if you sell the vehicle and buy one with a V8 if it is a V8 you want. Otherwise just replace the V6 engine with exactly the same V6.
V8 upgrade will almost certainly require a change in the transmission and most likely the need for a replacement diff as well. Then you will need to check any issues with the front end specs related to and necessary for the 5.7 V8 fitment including front brakes and front suspension.
Major upgrades are fine if you are willing to throw lots of money at it – such as people do with full restorations – but I expect spending lots of cash is not what you plan on.[/quote]
They produced well over 90 million small block chevrolet engines since 1955. A large majority of those engines could bolt right into that truck both at the mounts and directly at the transmission. The OP might have to move the frame side mounts forward into holes that will already be stamped into the crossmember from the factory. An LS engine could even be bolted into that truck and it would still fit the transmission directly. While not absolutely perfect, Chevy is awesome about interchangeability. The OP would want to have a complete donor truck to trade parts to and from because there will be parts that won’t swap over between the V6 and the V8. He’s got plenty of options to retrofit if he wants to ditch his PCM for a carburetor.
This shouldn’t be an expensive process either. Parts are everywhere which means parts are cheap. The popularity of the small block Chevy has given it so much aftermarket support, the Lego company even makes parts for them.
Replacement diff is not necessary unless he’s going to build the engine well above and beyond stock specs. Your most common stock 305’s and 350’s are only worth about 175-220ish horsepower in a lot of cases. (at least after certain fuel embargos and emissions laws anyway.) The front springs would probably need to be changed though. The stock springs will squat farther since they were only meant to hold up six cylinders instead of eight. The rest of the suspension and braking will be sufficient, if not identical, unless, once again, the OP is planning substantial power upgrades.
The entire exhaust may not be necessary. It might be enough to just have the V8 Y-pipe handy from the donor vehicle and it might bolt straight up to the rest of the original exhaust.
The 4.3 and the 5.7 both have 4.000″ bores. The 3.736″ bore should be the hole diameters for the 305’s.
@ the OP, do you know where your replacement engine is coming from? Knowing what to change is going to depend on the donor. Like I said, interchangeability is awesome, but not perfect. If you can find yourself a cheap donor truck of the same vintage, get the whole thing and just use it up as you need to.[/quote] Ah it would seem our posts agree with each other. And thank you for the correction on the bore of the 350… the latest engine I rebuilt was a 305 for a friend so the number was still fresh in my mind haha!
yes im do it and it will coming form junk yard the junkyard give you a complete wiring harness with ever engine you buy from them right im dropping in a 2003 4.3 v6 vortec engine in a 1998 blazer got the from this junkyard
[quote=”drivewaymechanic” post=115932]i have a 1992 chevy pickup with a stock 4.3l v6 that starting to smoke what would take to a 5.7l v8 in it ?[/quote]
Not sure what type of chevy pickup you have, but the site below shows how you can fit a SBC into a Chevy S10. Lethal combo as those little trucks are pretty light for a motor like that.
They have a catalogue on the site with all sort of parts and a manual to show you how.
Actually I see a lot of the hotrodded S10s around. My buddy had an 1990 S-10 with a 327 (think it was from an old 60s Nova) that went like hell.
Maybe you can contact them if you’re stuck. But if you have a truck that normally has the 350 as an option it shouldn’t be too difficult.
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