2000 Silverado with 4.8, maybe time for new motor have questions
#1
2000 Silverado with 4.8, maybe time for new motor have questions
So ill start out with the history
bought the truck with 260k miles on it, truck was in amazing shape, looked like it had about 50k miles and prev owner said the engine and trans had been replaced with a junkyard swap.
So i drove it about 3k and did the first oil change. The engine oil was sludge and the oil filter weighed a few pounds and was pouring out slime..
So i put seafom in the oil, intake, gas and drove it a 1k miles or so, did a engine flush with that de-gunk plus the seafoam that was already in it. and i have done the oil change with seafoam and de-gunk plus full synthetic every 2k miles since then and it has gotten way better but its burning oil now and you can kind of tell from the exhaust sometimes that its coming out. The first time i seafoamed it, it poured out black crud from the exhasust pipes
anyways i drive it everyday and have been on a few 1000 mile trips and its very reliable, pretty quick, and a fun truck
I just got a mustang coupe that I want to put a chevy motor in, would my best bet be replace this motor in the truck with another just stock 5.3 or 4.8 and put the motor in my truck in the mustang after a rebuild? that way they both have good new motors? if I put something else in the truck, will doing high compression pistons get me higher gas mileage in either one? anyone do any MPG builds on a 5.3 or 4.8 in the silverados?
any advise, not sure how in depth i wanna go with the mustang. I just want it to have decent power which i know a cam intake 5.3 will give me
but doing an 11:1 build or so give me better mpg?
ive seen ls1 trans ams and vettes see 27-30 mpg i want to achieve the same in my light weight coupe with a smaller displacement motor
bought the truck with 260k miles on it, truck was in amazing shape, looked like it had about 50k miles and prev owner said the engine and trans had been replaced with a junkyard swap.
So i drove it about 3k and did the first oil change. The engine oil was sludge and the oil filter weighed a few pounds and was pouring out slime..
So i put seafom in the oil, intake, gas and drove it a 1k miles or so, did a engine flush with that de-gunk plus the seafoam that was already in it. and i have done the oil change with seafoam and de-gunk plus full synthetic every 2k miles since then and it has gotten way better but its burning oil now and you can kind of tell from the exhaust sometimes that its coming out. The first time i seafoamed it, it poured out black crud from the exhasust pipes
anyways i drive it everyday and have been on a few 1000 mile trips and its very reliable, pretty quick, and a fun truck
I just got a mustang coupe that I want to put a chevy motor in, would my best bet be replace this motor in the truck with another just stock 5.3 or 4.8 and put the motor in my truck in the mustang after a rebuild? that way they both have good new motors? if I put something else in the truck, will doing high compression pistons get me higher gas mileage in either one? anyone do any MPG builds on a 5.3 or 4.8 in the silverados?
any advise, not sure how in depth i wanna go with the mustang. I just want it to have decent power which i know a cam intake 5.3 will give me
but doing an 11:1 build or so give me better mpg?
ive seen ls1 trans ams and vettes see 27-30 mpg i want to achieve the same in my light weight coupe with a smaller displacement motor
Last edited by Josh Manning; 05-14-2013 at 01:33 PM.
#2
TECH Senior Member
iTrader: (10)
Join Date: Oct 2004
Location: Crystal Springs, MS
Posts: 14,068
Likes: 0
Received 2 Likes
on
2 Posts
If your doin a Fox body ive seen a few cammed 5.3 and 6.0s with automagics getting high 20s in mpg.
Tuning is goin to be your mpg getter along with the right setup. 11:1 will net more power across the board of course, but more power=more fuel for the extra air. But i dont see it hurting with that light of a car.
If it were me, i would get a newer/cleaner engine for the truck and put the old truck engine in the car after a breakdown and inspection.
Tuning is goin to be your mpg getter along with the right setup. 11:1 will net more power across the board of course, but more power=more fuel for the extra air. But i dont see it hurting with that light of a car.
If it were me, i would get a newer/cleaner engine for the truck and put the old truck engine in the car after a breakdown and inspection.
#4
TECH Fanatic
iTrader: (6)
Just installed an LS1 in my dads 2000 that came with a 4.8 from the factory. It was the best mod hands down and we got the complete long block for $800 with half the miles of his old 4.8 engine. I would look into something like that, if your going to swap motors it doesnt take any extra time to swap to a bigger motor while your at it and your gas mileage wont suffer much if you can keep your foot out of it.
#5
Registered User
Join Date: May 2013
Location: Guthrie OK.
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
4.8-6.0 swap
Just installed an LS1 in my dads 2000 that came with a 4.8 from the factory. It was the best mod hands down and we got the complete long block for $800 with half the miles of his old 4.8 engine. I would look into something like that, if your going to swap motors it doesnt take any extra time to swap to a bigger motor while your at it and your gas mileage wont suffer much if you can keep your foot out of it.
Does anything else need to be changed?
Thanks in advance,
#6
TECH Fanatic
iTrader: (6)
OP, like I said above, I would upgrade the motor in your truck then do what Jonathan said and rebuild your truck motor for your car. Then you would have two vehicles that would be fun to drive and reliable.
#7
TECH Fanatic
iTrader: (137)
cheaper to go with what you got is a motto i usually go by when it comes to budget builds.
so i would get me a low mileage 5.3 truck. 4.8 is same block as 5.3. youll see 4.8/5.3 stamped on it. since it needs rebuild and 5.3s have been known to be bored out to a 5.7 bore and 5.7 internals swapped in, i would turn it into an iron block 5.7. more cubes and cheaper than 6.0. a 228 cam, 3200 stall, truck intake for budget or ls6 intake, same tb and computer, some 3.73s and you should have a pretty quick, lighweight, and still mpg friendly ride. if i can help with any other advice or 2nd opinion, just pm. good luck with your project and GOD Bless....rob
so i would get me a low mileage 5.3 truck. 4.8 is same block as 5.3. youll see 4.8/5.3 stamped on it. since it needs rebuild and 5.3s have been known to be bored out to a 5.7 bore and 5.7 internals swapped in, i would turn it into an iron block 5.7. more cubes and cheaper than 6.0. a 228 cam, 3200 stall, truck intake for budget or ls6 intake, same tb and computer, some 3.73s and you should have a pretty quick, lighweight, and still mpg friendly ride. if i can help with any other advice or 2nd opinion, just pm. good luck with your project and GOD Bless....rob
Trending Topics
#8
Thanks for the input guys! I have been thinking about swapping the 6.0 in my truck, i Just didnt want to see those horrible 11-13 mpg figures that the 2500 sees. I average 14.5 in the city and about 17-21 on the highway the difference between 1900rpm (70) and 2200rpm (80) makes a HUGE difference on my MPG
I would like a little more power when hauling in my truck, and i did think about the 6.0 and the 6L80e from a 06 or so wrecked something.
Also if i did take the 4.8 out of my truck and put in my car i would not reuse the 4l60e, it would be a t5 or t56 not wanting a full dragster like my last coupe, itll be more of a street car doing 65mph at 3400rpm sucks lol
I would like a little more power when hauling in my truck, and i did think about the 6.0 and the 6L80e from a 06 or so wrecked something.
Also if i did take the 4.8 out of my truck and put in my car i would not reuse the 4l60e, it would be a t5 or t56 not wanting a full dragster like my last coupe, itll be more of a street car doing 65mph at 3400rpm sucks lol
#10
TECH Fanatic
iTrader: (6)
Thanks for the input guys! I have been thinking about swapping the 6.0 in my truck, i Just didnt want to see those horrible 11-13 mpg figures that the 2500 sees. I average 14.5 in the city and about 17-21 on the highway the difference between 1900rpm (70) and 2200rpm (80) makes a HUGE difference on my MPG.