Camaro Zone Forums banner
1 - 14 of 14 Posts

·
Registered
Joined
·
271 Posts
Discussion Starter · #1 ·
4.8 liter pistons in a 5.3 block anything I need to know to make this happen? Help please
 

·
The "Senior" Member
Joined
·
18,266 Posts
You need to know if the bore is identical.
 

·
Registered
Joined
·
11,500 Posts
4.8 liter pistons in a 5.3 block anything I need to know to make this happen? Help please
You need to know if the bore is identical.
The bore's are identical, The 5.3 has a longer stroke, which gives its bigger displacement. Installing 4.8 connecting rods in a 5.3 makes it a 4.8......... 3.27" (4.8L) stroke compared to a 3.60" (5.3L)
If you are just replacing the pistons in the 5.3 with 4.8's and are going to use the 5.3's connecting rods, then it will still remain a 5.3.
 

·
Slow'erAss
Joined
·
10,393 Posts
I'm curious....what are you paying for this? The machine work and having the motor assembled will end up costing roughly the same as a used LS1.

What are you doing exactly?? I know you are trying to get it running, but have you checked out all options to do so?
 

·
Registered
Joined
·
2,092 Posts
The benefit is more compression. You would need to be able to disassemble the 5.3 rods and reassemble the 4.8 pistons on it. It's important to keep all bearing and bolts, as well as rings in the same spot, and same orientation on the 4.8 pistons as they were on the 5.3. Then you have to have it balanced.

In all honesty milling the heads is cheaper and easier to gain compression.
 

·
The "Senior" Member
Joined
·
18,266 Posts
The bore's are identical, The 5.3 has a longer stroke, which gives its bigger displacement. Installing 4.8 connecting rods in a 5.3 makes it a 4.8......... 3.27" (4.8L) stroke compared to a 3.60" (5.3L)
If you are just replacing the pistons in the 5.3 with 4.8's and are going to use the 5.3's connecting rods, then it will still remain a 5.3.
Changing the rods won't change the stoke because the crank determines the stroke.
With the same crank and shorter rods the stroke will be lower in the cylinder resulting in lower compression..
 

·
Slow'erAss
Joined
·
10,393 Posts
True. Crank determines the amount of travel the piston has within the cylinder, not the rod itself.
The LS1 rods (unless building something out of the ordinary) are 6.125" in most aftermarket cases.
Although it does appear as though the 4.8 used a 6.276" rod.

Are you getting new pistons? What are you piecing together exactly?
ENGINE: Liters: Cubic I: Bore: Stroke: Rod Length: Comp:
LR4 -- 4.8 -- 293 -- 3.780 -- 3.268 -- 6.276 -- 9.5
LM7 -- 5.3 -- 325 -- 3.780 -- 3.622 -- 6.098 -- 9.5
LS1 -- 5.7 -- 346 -- 3.898 -- 3.622 -- 6.098 -- 10.1
LS6 -- 5.7 -- 346 -- 3.898 -- 3.622 -- 6.098 -- 10.5
LQ4 -- 6.0 -- 364 -- 4.00 -- 3.622 -- 6.098 -- 9.4
 

·
Registered
Joined
·
11,500 Posts
Changing the rods won't change the stoke because the crank determines the stroke.
With the same crank and shorter rods the stroke will be lower in the cylinder resulting in lower compression..
That's right! I knew that ... Another oops. Not sure what I was thinking
 

·
Registered
Joined
·
271 Posts
I'm not doin this because I want too the motor I got the pervious owner tab diesel through it and it needs new pistons I am also applying 799 heads and having them milled

And paying for machine work isn't log to be bad I'm friends with the guy that owns the machine shop here

Going*
 

·
Registered
Joined
·
271 Posts
Just going to go with 5.3 flat top pistons f all the bs lol same diff as the 4.8 pistons

Lol glad I could help make you feel better about yourself! I feel like an idiot too but I'm learning all this stud like everyone else and I do the research to help myself
 

·
Registered
Joined
·
1 Posts
The bore's are identical, The 5.3 has a longer stroke, which gives its bigger displacement. Installing 4.8 connecting rods in a 5.3 makes it a 4.8......... 3.27" (4.8L) stroke compared to a 3.60" (5.3L)
If you are just replacing the pistons in the 5.3 with 4.8's and are going to use the 5.3's connecting rods, then it will still remain a 5.3.
The rods are longer on a 4.8 and crank is different then 5.3 plus the flat tops are the difference in a 4.8 and 5.3. Putting a 4.8 crank and rods in a 6.0 is like a stroker engine.
 
1 - 14 of 14 Posts
Top