whats the difference between a 4.8 vortec and a 5.3 ls1 out of a camaro?
would it be possible to switch the intakes???

 

well if you are asking about the 4.8 and the 5.7L than:
Bore
Stroke
Pistons
Rods

if you are askin about the 4.8 to the 5.3L (both truck motors)
Stroke
Pistons
Rods

also if you are refering to the manifold, any LS motor manifold will fit on any other LS motor (barring LS7 L92 L76) the LS motors include

LS1
LS2
LS3
LS6
L33
L59
LM7
LQ4
LQ9

I know i'm forgetting one so feel free to add

 

a search in the GM section will yield tons of info