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Pretty well known issue with hot rod folks here. My coworker has a holley on his 69 firebird, doesnt even try to start it in the spring without replacing the float bowl gaskets because of leaks. The one piece fuel bowl and no power valve blow out issues are two real advantages of the Edelebrock

Freshwater they generally dont corrode, but could have debris in them. Would open to inspect the water passages. Also possible that if the water pump impeller disintegrated there are pieces of it clogging water flow, especially in thermostat housing . folks here can walk you through it.

In general the edlebrock is a good carb very easy to tune If needed. I have. Two one on the boat and one on my 65 GTO. I wouldn’t hesitate to by an other one.

Remove the risers from the manifolds and inspect the water passages. not sure the year but if used in salt or brackish and they are 5 + years old likely they will need replacement . Drain the manifold before you take the riser off

Its typical to see a 20-30 degree difference in manifold temps. If you can keep your hand on them I suspect you are fine. Might want to use an IR thermometer to check temps.

It depends on how fast you consume the gas. In my experince if you burn through it I have not had issues from typical pump gas. I run ethanol from the pump in my jetski because I fill it from a 5 gal can and go the marina to fill the boats 37 gallon tank because it is easier and worth the $ for...

Maybe 25-30 seconds. It seems like a long time when cranking and the buzzer is going off. I think not only is it refilling the bowl but getting gas through the idle circut passages again.

you didnt say what youre working or what engine is in there now. If you have a 4.3 currently the V8 is about 4.5” longer

Yes throttle cable bracket and fuel are also different

Mine is close to that and a 2004

20 minutes to get warm is a long time check the thermostat frirst. Yiu may need a carb cleaning and rebuild as well but take take of first things first

Boat will run the same if it has holes here, brazed, or epoxied. As long as the rest of the bell housing is not corroded you are fine

How did you seal the vertical drive shaft in the upper to hold 15 psi ?wondering as i would like to do the same test of each half

Both the mercarbs I’ve had had an electric choke - 1990 and 2003 they were oem mercarbs not messed with.

Depends on what you want to do with the boat. Price and warranty are nice. For 20 years my family (parents bought used and i took it over) had a Sea Ray 170/3.0 engine - boat was great for many reasons but in the end was small as my kids got older, pounded in rougher water., but was very...

It does not bother me so much because otherwise the boat performs really well. my dad lives on a lake so i keep the boat there, he is retired so maybe with too much time on his hands bothers him more. He sprays a little staring fluid in the flame arrestor this runs the engine until the carb...

I saw this on another forum re Vortec seal clearance https://www.alexsparts.com/valve-spring-kit-sb-chevy-vortec-hi-perf-hyd-flat-tappet-110-lbs-seat-pressure-vsk4h50/ i was researching some clearance issue for my 65 gto, came across this seller had retainers and lock options that provided...

1996 and up vortec heads will be the same and intakes will swap over. If you are swapping an automotive engine not only the freeze plugs but head gaskets and water pump need to-be marine. If yku are using a truck engine the cam will work for marine applications, but car engines have different...

Only other place to check in addition to where rick said is in the water cross over under the thermostat, but that wont help you if no draining was done.i think there is separate plug in the front of the intake on 4.3 s that can get missed if the restof the engine was properly drained

yeah i figured 30 was total advance as i doubt it would run even ok if you were that far off. traditionally you set base or initial timing then as long as advance system ( mechanical or electronic) works you are ok. Its always good to verify total advance is ok, typical marine is 26-30 degrees...