Description:Compression makes a big difference to many things in the way the engine makes power, not just top end either, you can expect better throttle response, economy, torque and power. There is not a fixed gain from porting the heads, it comes down to the combination. A Over the Radiator cold air intake is also require for maximum performance. A Fast manifold can help but its really only beneficial on a high rpm big camed engine or a stroker. Will this be fine with this pack.