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Home depot does not sell proper marine coatings. Neither does rustoleum

max HP on the Nov 360 (12') is 40hp. anything more than that, you will kill yourself https://novurania.com/deluxe-series-360/

cell phone and boat US towing membership

this could cause rusty valve seats or bent valves or broken valves the fix is to remove the head and have it serviced.

'nuff said

there is no "likely cause" you need to do a leakdown test to determine what is the reason here are possible reasons (not in any particular order) leaking exhaust manifold causing rusty valve or valve seat (if so, other valves may be close behind) broken rings hole in a piston from detonation...

lets not. its been rehashed to death. however for some reason the search function isn't pulling up the past lists. assuming you have all the updates done over the years...... larger heat exchanger, exhaust elbow change, etc. so much easier and cheaper to pull the motor and drop in a proper...

are you looking used or looking new? if you are looking new. buy the new ones that have been modified for proper seals and screw in studs. thats about $900 thru GMPP. you can also get them thru Summit Racing if you are looking for used. any good machine shop, especially ones near an oval...

the first of a few hundred thousand would be my guess https://forums.iboats.com/threads/frozen-and-busted-blocks-in-texas.742470/#post-5642840

would help to know where you live. plenty of rebuilders in every major location.

the beauty of the carb is it will flow only what the motor needs. on top of that, keep in mind the 4.3's get 600-650 CFM carbs, the 5.0's get 650-700 CFM carbs, the 5.7's get 700-750 CFM carbs and the 7.4's and 8.2's got 800-1050 CFM carbs your fine on the carb

Any 3.0 1990 or prior will work

There are 580,000 boaters in Texas. Not a single one of those boats were winterized....... Since about 250,000 of those boats are I/Os and only about 50,000 are moored..... There are about 200,000 motors that have suffered a thermal declination related phase-shift inspired block busting event...

if you didnt drain all 5 drain locations (intake manifold t-stat cross-over, block drains and manifold drains). expect to have a busted block...... and exhaust manifolds regarding home-owners insurance, that is between you and the insurance company.

I would never trust the manifold myself. only way to test the block is to pressure test it, or take to a machine shop and mag-particle it.

wait a minute.....back the truck up. generally stock 305 heads have too small of valves for a 350 and have too small a combustion chamber to run on pump gas without the motor detonating like teenager boys at their first peep show. what head casting do you have? very specific. if you have...

if the new 5.7 is a vortec, your plugs are way too short.

loose spark plugs would prevent proper heat sinking and the plugs get hot, cracking the porcelain

now acetone test the manifold. if the manifold was cracked on the outside, it may also be cracked on the inside.

gotta go with new on the vertical driveshaft. the internal splines wear, then strip and leave you stranded needing a tow. 100% of the vertical driveshafts will fail - its a design flaw. the used one you bought will most likely fail soon as well. look at the splines.