Mercruiser 3.7 distributor & fuel pump questions

[gw204f]

The good news... It looks like I don't have the old syle "bad" riser gasket...

Port side



Starboard side




The bad news...

I redid my compression tests on cylinder 4. One cold and one cold/wet. The plain old cold test blew 92. After that, I added about 1 tbsp of oil, let it sit for a few minutes so the oil could work it's way into the rings and ran the test again. 106. Looks like my compression problem isn't in the top end after all. :-( That being said, it was encouraging to see the cold compression at 92 instead of 42 like the first time...

Prior to buying the boat, the seller did tell me that he sucked up some seaweed and I believe overheated the motor. His insurance paid for a bunch of stuff to be replaced, but he didn't recall what. I didn't know how sensitive this 470 was to overheating at the time, so I didn't think much of it. I am going to try and talk to him tonight to get some more information about what was done.

Sigh...