cannot make over 10 psi of boost

[sacarguy]

Originally Posted by deuce_454

your headers look VERY blue, my guess, (which is only a guess) is that the turbos are on the small side, you could be at the surge limit at 10 pounds, have you done the math and checked the turbo maps?? it could be that the housings are the limiting factor.

you could be moving the same mass of air at 10 pounds thru the bigger heads as you weer at 15 pounds with the old ones.. and its the mass, not the pressure that matters, the ET 245 heads flow like a MoFo and on a 402 with your super optimal intake and hot side tubing, you could be outflowing the turbos

not even close those t-67 can support over 700 horsepower each no way they cant supply more then 10 psi to that motor he would be having to make 1000 rwhp at 10 psi to out flow those turbos.

did you change the cam shaft profile to much over lap can easily cause such a issue