5.3 block convert to 5.7
#1
5.3 block convert to 5.7
I have 4.8 liter silverado that I would like to modify. I want to get a 5.3 punched out to 3.893 making it a 5.7, so naturally I have a couple questions about what I will need and what I can get away with.
1. Will I need different heads or will the stock ones work fine with 5.7 head gaskets?
2. Does anyone have suggestions for what cam to use?
This will be a daily driver/light towing vehicle for reference.
1. Will I need different heads or will the stock ones work fine with 5.7 head gaskets?
2. Does anyone have suggestions for what cam to use?
This will be a daily driver/light towing vehicle for reference.
The following users liked this post:
noobnoob (07-02-2018)
The following users liked this post:
noobnoob (07-02-2018)
#5
That's got me thinking, have you heard of anyone just boring out a 4.8 to keep factory crank and rods? I'm on a college student's budget for this project. I'm also going to replace the lifters since I've got the all to familiar chevy tick. Also, will I be able to retain factory fuel pump/injectors? Will I need to have my truck tuned after this?
Last edited by noobnoob; 07-02-2018 at 09:38 PM. Reason: add to question
#6
TECH Senior Member
iTrader: (2)
Fuel pump is fine on a just a cam swap and engine size increase. Factory pump can support a 6.0 with a mild cam just fine.
Stock injectors should be upgraded to like 31lb/hr for extra fuel flow. Those are factory 8.1 injectors that most use.
A tune is a 100% must do, no way around this.
Stock injectors should be upgraded to like 31lb/hr for extra fuel flow. Those are factory 8.1 injectors that most use.
A tune is a 100% must do, no way around this.
The following users liked this post:
noobnoob (07-03-2018)
Trending Topics
#8
11 Second Club
iTrader: (13)
If you have E85 available you can use flex fuel injectors. Also you can use marine 8.1 injecotrs. They are 42lb/hr and can be found for cheap as well.
You can cheap out and use your factory injectors and stock cam if funds don’t allow for everything. Still need to get it tuned after engine CI increase
4.8/5.3 are the same blocks ( same bore size as well )They just use slightly different rods, and the cranks are different ( same tone rings, just different lengths ) you could find 5.3 rods for probably a song and a dance. You could probably get away with 5.7 bore size and a 4.8 rotating assembly but the CI won’t be there. It would be close to around 310CI FWIW
That’s using the 4.8 crank, rods, a flat top piston, 58cc heads with a .051” head gasket
You can cheap out and use your factory injectors and stock cam if funds don’t allow for everything. Still need to get it tuned after engine CI increase
4.8/5.3 are the same blocks ( same bore size as well )They just use slightly different rods, and the cranks are different ( same tone rings, just different lengths ) you could find 5.3 rods for probably a song and a dance. You could probably get away with 5.7 bore size and a 4.8 rotating assembly but the CI won’t be there. It would be close to around 310CI FWIW
That’s using the 4.8 crank, rods, a flat top piston, 58cc heads with a .051” head gasket
Last edited by MrHorsepowerLSx; 07-03-2018 at 03:12 PM.
The following users liked this post:
noobnoob (07-03-2018)
The following users liked this post:
noobnoob (07-03-2018)
#10
I'm probably going to cheap out, I don't want to break the bank just yet. The bore is more important right now and I do NOT want terribly cheap pistons or machine work. Speaking of the tune, I don't have a trailer big enough for my truck. Will I at least be able to drive it to wherever I end up getting the tune done?