Originally Posted by jrpxxii
What kind of boost are you looking for? Boost more than the actaul power level will lift the heads as you will need to look at the heads closely for seapage as Im guessing at that power level its going to take alot of boost. I have 6 bolt heads and lifted them earlier this year but new gaskets and retorqueing them fixed the issue but this is still on a lower boost tune of 26lbs. My intake setup is similar as well and you can split the elbow in half and weld a piece of sheetmetal to split the airflow in half to help with airflow from front and back cylinders unless you have software that allows you to tune each individual cylinder for air and fuel. I am running the Holley Dominator EFI software and I can adjust each cylinder to exact specs and make sure each spark plug reads identical.
I am going to run about 25lbs of boost but at the compression I am at and on E85 its a little easier to make big power on less boost. My last combo was a completely stock 6.0 LQ9 shortblock, stock ls3 heads, LS9 cam and on 22lbs it was 1,100hp. On my edelbrock elbow its already split inside..? I have been reading that they always were not split so I find it interesting mine is. I had good luck on my last setup not pushing water. LS9 gaskets, copper coat, tq to 85ftlbs, heat up the car and re-tq. Its crazy how much they suck down once the motor is ran and warm.