I知 currently building an lm7. I知 considering boring the block but need to know how much of a bore I can put. Looking to also upgrade the cam. How can I know if I have a good combination with the bore & cam? What other parts do I need to upgrade? I have stock 862 heads, can these be used with a bore and cam? Does the crank need to be upgraded? What about the torque converter or injectors? I知 honestly kinda lost and need help. The motor is in a 3/4 ton so it痴 backed by the 4l80.

 

What kind of use will it see? This is important. In a 3/4 ton truck you will still need as much low end power as possible, especially with a 5.3L
How many miles on it?
The crank will handle over 700HP.
Injectors are decided by target power level.
Torque converter decided by power band.
Tell us about your REALISTIC goals
It will surprise you how much power can be made with few mods.

 

I知 not sure the miles as the previous owner claims he didn稚 even know it was swapped. It値l be my daily but commonly used for pulling as well. I知 looking to get between 450-500hp and torque or more torque. I know I can easily build the top end for the power but that can cause me to not have the torque I want at the same time.