are the connecting rods in a 5.7 the same at the 4.8 and is there any advantage to switching them?

 

They are a different length. The 4.8 rods are longer to accomodate the shorter stroke of the 4.8. If you're going through the trouble of tearing the engine down for new rods, I'd look into aftermarket pieces if I were you.

 

well the only reason i'm considering this is b/c i can get them cheap and i'm putting a turbo on. shorter rods = lower compression but i also have 6.0L heads sitting in my garage doing nothing.

should i just do the heads? just do the rods? do both? i dunno

the most boost i will prob run is 8 to 10psi

 

are you saying you want to use LS1 rods in your LR4 with stock LR4 pistons?

 

forgive my ignorance... but why is that a problem? and i dont have to. I was just wondering if it was worth it or possible

 

if you use the stock rod for the 5.7 with the stock stroke crank and stock pistons from the 4.8 you're going to have too much piston to deck clearance unless i'm missing something.

 

Nope you are right Zippy. Blacksilver you would be much better off using the 6.0L heads, as long as they are the casting #317, than the internals swap. It will drop your compression to around 8.5:1 or so if your are thinking high boost levels. Plenty of folks here have abused the 4.8L engines with no failures near 600HP.
There is no difference in the strength of the internal parts and the 4.8L is the only GenIII motor with the altered crank/rod length. The 5.3, 5.7, and 6.0L are identical short of bore size.
If your motor is out you might want to add some ARP rod and main bolts else have fun!

 

thanks guys for the good advice

6L heads are go