Originally Posted by NemeSS
if u really want ci. the 6.0 is the way to go. why spend on building a smaller displacement stroker when can have a 408 for about same price.
it takes more metal removed from 4.8/5.3 bore block than 6.0 lq block. lq can go up to .060 or 4.060 bore.
it will probably cost more to have 4.8 block machined since more metal has to be removed than a 6.0.
my 4.8 with low scr built for around 20psi.
Here was the reason why i went with the 5.3L build instead of the 6.0L.
The 6.0L costs around $1000-$1300 depending on mileage and "your" specific area and market.
I picked up (2) LM7 5.3L for $350 (one ran with 250K and the other had a owner induced intake fire, so i assume it would have ran fine)
The machining costs and gaskets needed between the 5.3L and 6.0L we will call a general wash even up cost between the both of them.
The 6.0L i assume will be bought running and installed as-is with no internal work performed.
The 5.3L would need cam, machine work on block, crank and maybe heads. I bought a set of 243's. New pistons (5.7L versions) will need to be bought and then the odds and ends (bearings, timing chain, etc.)
So i have $750+ "extra" to spend on the 5.3L to 5.7L conversion vs. buying a USED 6.0L ...... and I will have a brand new motor vs. a USED 6.0L in my car.
Pistons/rings $275 set (not forged)
Crank reground $90
Boring $20 a hole ($160)
Block cleanup and deck machining $100
gaskets/seals/head bolts ($225+)
Cam crank rod bearings ($125)
Intake LS6 ($300+) depends on the deal you find
Injectors ($ ???) depends on what you want
baance rotaing assy. ($ ???) depends on your area.
other misc. costs that will pop up.
So im going with this and have a new motor that should last alot longer that the 6.0l assuming the used 6.0L had a substantial amount of miles on it. You never know if people ever changed the oil on a used engine....or ran it with a compromised cooling system or god knows what.
Ive bought plenty of used engines and got many great deals and runners so im not knocking them...im just saying i prefer to have a new one in this case.
Of course i would go with a new 6.0L or rebuild one if i were putting it in a truck used to haul often OR in a car that spent most of its time "earning" money on a track but thats not the case for me.
So 5.3L converted to 5.7L is it for me.