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Sacrificial anode on both sides from most saltwater dealers

As you found out, the 2016-2018 300 sc are prone to failure. Later models are better but still not as good as they should be. Make sure you clean up your housing if it has any damage.

The problem probably wasn't the impeller coming off. That was the result of your idf locking up. You can use a slide hammer to get the driveshaft out while doing some wiggling and twisting.

It is completely normal for the engine to have areas of rotation that are considerably more difficult to rotate. This is because you have to overcome the valve spring compression force where sometimes there are many valves opening at one time and conversely the valve spring can aid in rotation...

change your spark plugs, you can't tell anything by looking at them and that is exactly how they start to fail when the engine will surge in and out

Yes, under the right circumstances but they aren't random. It won't throw the code until it is running and the reading from the sensors aren't in alignment with each other. Low cylinder pressure can change rpm, manifold pressure, TPS, CPS, etc. to have misaligned readings from where it expects...

Did your ceramic washers break? If so, you need to pull the engine and thoroughly clean.

Yes, 2002-2005 is all plug and play. Here's what you need for the conversion harness: Ebay cluster conversion

You can't just switch the 05 to 06 longblocks but there are workarounds. The 06 went to the cps at the 7 o'clock position instead of the 12 o'clock position. You can drill a hole in the mag encoder wheel and move it 2 bolt holes. I did a complete write up on this many years ago which details...

Could be a broken timing chain. Simple to take the valve cover off.

It's on the backside of the muffler exit neck but typically that code thrown at full speed is a clog in the exhaust manifold exit at the 3 or 4 small holes

Probably not because it's intermittent. I always just put a known good one in test.

Cluster should power on when you press the start button without the key on. Replace your 30A relay if i it doesn't. The cluster will need to be married to your ECU with BUDS for it to run.

The plastic bearing spacer faces towards the inside of the supercharger for both bearings.

It happens quite a bit. The 155s are worth more. There are several ways to tell the difference, from hardest to easiest, imo. 1. The camshaft is different between them on the earlier years like yours but not for 170hp models for newer years. Remove the valve cover and cam gear and look at the...

Have seen bad mpems do that on the early 4tecs.

No, comes from inside your pump. Hose is top right where the pump bolts to the hull looking on the inside just to the right of the 2 smaller ones in the middle for the bailer lines.

Nope. No water coming out on that model. Pump intake is probably clogged.

There's other places that reflash ECUs as well.

You can always get a new ECU from the companies that reflash that specific program to a used ECU like Torx Racing.