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Entirely possible the water coming in the combustion chamber is from the exhaust.

If the heads are still on leave them and pressure test the block and heads together.

https://www.summitracing.com/search/part-type/machinist-straight-edges

Agreed on Sierra- to OP I would call MM and speak to one of their tech support folks to make sure we aren't missing anything before purchasing another module.

Check for spark. If you put starting fluid in it and it didn’t cough suspect u have no spark. also if you had a head gasket done was it running afterwards? might be the valves arent adjusted right and there is no compression. What cuased head gasket failure

What was it doing that caused you to rebuild it. normally the biggest issue is getting all the passages clean heres a couple of screen shits of manual pages showing setup for mercarb would assume sierra uses the same carb set ups. Check float isnt water logged

Normally gen 2 have a flat annode, maybe some of the non PS 3.0 s had them. Either way trim the tab and get on with your boating

unless the original core was bad either rebuild it with a good kit or send it to a place like Mikes Carb Parts For rebuild. I would question a mechanic who couldn’t or wouldn’t rebuild a OEM carb,unless the carb core/body was screwed up, only to put a cheaper aftermarket carb on. the mechanic...

intake is fine if it is dual plane, which it looked like in photo in post #7 you can see the runners are on two different planes, so it is actually an upgrade as long as you are in fresh water. Salt or brackish will rot a non marine aluminum intake. just get a marine carb and you are good to go...

I would try sending both your modules back for replacement as that is the only thing it could be. Unfortunately you aren’t the first person weve seen on here who had to try multiple modules to get one working one. might be worth a call to a place like Michigan Motorz. When i bought my...

Pretty sure the Q1 part is the quicksilver version of the mercury K1 version. Merc and quicksilver use basically the same part number except for a digit or character. Same part sold through merc dealers or labeled as quciksilver anywhere …. Both require the correct thrust washer i suspect that...

Did you check the block and head surfaces for flatness could have warped either and be the source of leaking. Normally need to use a machinist straightedge and feeler gauge

http://marineengines4less.com/images/companies/1/EST%20Ignition%20Instructions%20-%20ME4L.pdf?1431462059320 the wiring diagram in the install instructions show only one wire to shift interrupt timing shunt has the two white and a black to 12 v +..

that I do not know maybe @achris does . He may also have some ideas on your noise as I would expect a gimbal and u joint replacement to take care of it

I think yours is a a dual plane - likely an Edlebrock Performer. That is not a marine carb. as outlined about would swap it for a Edlebrock 1409. Yes all stock marine cams are fairly sedate in terms of duration and overlap, but usually there was a 15-30 hp diff between 2 bbl and 4 bbl...

then it is no issue you have an issue making power which you wont notice on the hard because there is no load on the engine

Check out this video gives an idea of what comes out this Chris is a moderator here and has excellent videos all worth watching Would think you can pop it out and feel for roughness. I assume yours has a drive lube monitor so it wouldn't run dry if input shaft seal leaks

That's what I was thinking too. Somebody was short a vacuum cup assortment ...

if it is not moving around at idle it is locked in base mode. Module only in there. I would try as AD suggests pulling the plug off. Only thing I can think of is if you are getting 12 v to the base mode wire ... Assume balancer hasn't slipped such that you are not actually at TDC ... grabbing...

yes the deck is taller on a 351 hence the wider intake bolt spacing Take a picture of the carb, thinking it is an old Carter AFB given the sticker and the fuel inlet location. I would verify it is a marine carb not an auto one... Not sure if the Old carter AFBs (that sticker predates carter...