Dazed and Confused
Join Date: May 2012
Location: Upstate New York
Re: Building a 331 need some info
Maybe. This is where the expertise of a good tuner\builder comes into play. You have to remember, the more air you put in, the more has to come out. Duration, LSA and lift may (and probably will) compensate for a smaller valve. Regardless of engine design, the more low end torque you add, the more you take away from the top end. Some designs have a flatter torque and HP curve than others, but even then, this holds true. The quickest way to change the torque output and hold your high end power is with rear end differential ratio. 4.11's are the most popular for street and combining it with a 6 speed (or better) transmission. The higher the number of gears result in a broader range that you're in your peak power. I was personally skeptical of how well this works until I drove an F150 EcoBoost with sport mode and a 10 speed transmission. My truck has a HO 5.0 cammed out with a 5 speed manual and 4.11 LS in the back. I'd love an extra gear with a higher speed final drive, but the price of a transmission to give me that is a little out of my reach right now. However, first through third, I can almost make my '73 drift with 30" Goodyear Wranglers.
Ever notice that there's so many high performance parts available for GM products?
Did you ever think that maybe they NEED them?