is this possible? or is the biggest switch from 5.3 is to 6.0?

 

it can be done but your going to have to get a new computer due to the crankshaft reluctor wheel

 

and if i switch to a 6.0 will i need to get a new computer?

 

That conversion would be easy the 08 avalanche is already a 58x on the reluctor wheel give the details on what all you are trying to do and will tell you what you need....

 

u can do it if u swap to new engines with 58x reluctor

if swap is to l92 or ly6 u will need the computer to control the vvt (not sure if u can load the vvt program on ur ecu)
the other newer engines (ls2, ls7, l76) will fit but the accessories are different sometimes

hope the guys will help u more

whats the numbers on ur setup?

 

my avalanche is doing pretty good now i dynoed it last week...397.5 hp 420tq...but im looking to swap my engine block..

 

im looking forward to switch to a 6.0 or 6.2 block...im just thinking over what do i need to put it all together and start..

 

it didnt come to my mind that u want block only lol

for the stock heads or stage 2.5 am pretty sure they wont fit on 6.2
also the 6.0 come with the l92 heads style with smaller valves i think

for stage 2.5 i think the 6.0 (4.00 bore ) is the max size u can fit them on

u can call texas speed and ask them

 

thanx man..im probably gonna stay with my 5.3 until i get bored from it...

 

True I didn't look at the vehicle, I just assumed it was an earlier model,