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compression and or leakdown test will reveal bad head gaskets

If you are in salt water typical rule of thumb seems to be 5-7 for manifold and riser replacement

The 4.3 and v8 use different exhaust elbows in terms of angle. also if you have a riser they use longer elbows. Yes you can use exhaust hose or silicone hose to make up the difference

There are a lot of cheap chit carb kits out there. mikes carb parts is my go to place for mercarbs Kits . might have been the check ball stuck I there. I had a situation a couple years back on my 65 gto. Had a relatively new edelbrock 1406 on it, took that off to put a tripower on it (3 x 2...

if you had that much crud in the passages, get a ultrasonic cleaner (cheap off amazon etc is fine) and use it to clean the carb- when i got mine, my carb rebuilding quality improved dramatically

the accel pump has no affect on the fuel coming out the throttle shaft

check ball missing or stuck . Depends some have check ball in bottom of well that pump goes into. When pump pushes check ball prevents fuel from getting passed back to bowl. There is also a check ball in the discharge line below the staked metal T in there. these can get stuck and not allow fuel...

it is unmetered, the throttle shaft is below the boosters and the idle and transition circuits. If you are into classic cars some carbs like the Q-jet are real prone to it and very common to have to rebush the throttle plate. The rochester 2 jet like on my 65 gto the throttle plates are cast...

If you fix the flooding from the bowl you won’t see fuel on the throttle shaft. Shaft isn’t letting fuel out its dribbling down the bore and across the shaft. While after a lot of use the shaft can wear and create a vacuum leak, this is in cars with a lot of miles on them. Can almost be sure the...

Float bowl is over full and leaking over. Needle and seat , float not working or too much fuel pressure

Ight be easier to use a short section of braided hose where the nipple is. Mount your sender and switch solidly to engine or bracket. Connect to oil block via a hose to take the weight off it and allow some flex . A place like McMaster car will sell hoses as will any hydraulic shop

more flow will give a stronger vacuum signal in boosters/ venturi so would expect more fuel. Yes marine tends to run cooler and under heavier load needs richer mix to some extent. Basically vs auto application that spends a lot of time in part throttle cruise A marine is closer to wot and...

on a 4.3 or larger engine?

Yes and no. I bought a angle torque wrench when I did the timing chain on the mini a couple years back. Found out the POS didnt work right after I broke a bolt, finished the job using a sharpie on the bolt head to get the angles. you can do it that way in a pinch and I had zero issues but If I...

Here is one https://forums.iboats.com/threads/stumbling-edelbrock-1409-4-3l-v6.670697/page-2

Cant comment on sierra but they are known as a better aftermarket. Most of the time you hear OEM and Barr are the best. I have Barr on mine no issues for over 10 years in fresh water. Barr does some OEM casting for Merc and I thought edlebrock but they are not much of a savings vs OEM. Might...

yes as steel head gaskets will corrode in freshwater (rust). How long it will take ? not sure but doesnt make sense not to change gaskets if you are that far into it.

you cant really jb weld the internal valley cracks, may also be one in the bottom of the bores/ crank area generally what we have seen here is the stock truck cam is close enough to work just fine. in the old days cam manufacturers would have a class of cams called towing/RV/marine all ground...

Jasper seems hit or miss In reviews. truck engine stripped to long block swap head gaskets core plugs (some are brass or stainless already) and marine circ pump. Then swap all your accessories over, you should check your intake and exhaust for cracks. My 4.3 had roached exhaust from freez damage

No any 96 and up 8 bolt intake vortec will work. I did the same project on a 2004 sea ray the 090M block casting 4.3 uses some metric fasteners . The side motor mounts, starter, and flywheel cover bolts are M10 vs 3/8-16…just had to buy about $40 worth of bolts. shouldnt Be an issue if staying...