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The big-block Chevrolet has a firing order of 1-8-4-3-6-5-7-2. This means that In each exhaust manifold, we will have two cylinders that will fire In succession. Cylinders 8 & 4 on the starboard side manifold and cylinders 5 & 7 on the port side manifold. In the images of the competitor exhausts below, we can see the manifold has a divider that separates the exhaust pulses from cylinders 8 & 4. This divider keeps the exhaust gases of the number 4 cylinder from entering the number 8 cylinder when the number 8 exhaust valve Is still open. The port manifold actually groups cylinders 5 & 7 together. Without a divider between these two cylinders, the exhaust gases from the number 7 cylinder will enter the number 5 cylinder when the number 5 exhaust valve Is still open. This Is not what we want. Using this style manifold on both sides of a V8 engine Is not very efficient. As shown on the Seaward manifold however, all ports are truly separated, leading to better exhaust performance.
*What can you expect from a new performance exhaust system*
A new Performance exhaust manifold and risers can provide feel of a noticeable improvement in the motors breathing much better as the engine(s) respond quicker to the throttle input, The risers stay significantly cooler vs the OEM risers it, and the water cooling temp is lower than before.
The combination of less weight on the rear transom area of the boat, with a faster response time to throttle input, quicker gas exhaust exit from the system and a cooler running system makes the boat perform better than before out of the hole and get quicker to chosen speed at all RPM ranges.
A very slight louder exhaust is only noticeable when flushing the engines out of the water, and a very slight deeper sound (more bass to it) exhaust under the water.
