i dont mean to jump on the thread or anything just curious... what would the the torque difference between a normal chevy head vs vortec heads? are they really worth the 800+ dollars for the intake and heads?
From some of the research I have been doing. They are a 40+hp bump over swirl port TBI heads. It's the combustion chamber design. I would say you could possible see atleast 40-60 ft lbs as well. Bolt on power.
Now with a proper cam and stockish compression there are guy 390fwhp and 400+ft torque. Those are higher revving motors with huge lift cams.
A good 4x4 cam on a 350 about 9.5:1 could easily see 260+ WHP and over 350ft lbs