Cooler intake manifold

Cooler air is smaller air. Smaller air means more oxygen in the cylinder. Getting every molecule of oxygen you can get in there makes more power. We can always add more fuel to use it. (well almost). On an LA small block, the intake has coolant flowing through it. So it will be 180 degs? The air charge spends so little time in the intake tract in a running motor, there is probably zero heat transfer from the intake to the air stream. However, the fuel does spend significant time sitting in the bowl being warmed up. A good phenolic spacer, size will be trial and error. Reducing the fuel temp and the air supply temp will see the most gains. Outside of the engine compartment air supply.