If the manifolds were cracked on the outside, good chance they were cracked on the inside (exhaust side) also. That’s why it dumped water into the cylinders.
With your admitted lack of knowledge. Get a surveyor and have them give it a pre purchase inspection.
The survey should include both out of water inspection as well as a good in water evaluation.
20-30 minutes of run time including brief WOT operation should be included.
A good surveyor...
There are 2 oil seals between the upper and lower housings.
Have you ever had the drive separated ie, removed the upper from the lower?
Maybe the seals are leaking or if it was recently done, possibly didn’t seal correctly?
They are O-rings that just sit in grooves.
Check it part number...
32 gallons across 2 motors.
So 16 gallons per hour each cruising.
1-2 gallons per hour idling.
The 8-9 gallons per hour was a guesstimate across all hours of usage.
How many total gallons did you use last year?
Hours may not be the best correlation between marine and auto engines.
Gallons of fuel used may give a better perspective because marine engines operate at much higher loads than auto engines.
I average 6.5 gallons per hour throughout the season in a 24’ boat. That’s 12-15 gph cruising down...
For a side window, roll it down halfway. Then look at the edge. Laminated glass will have 2 thin pieces of glass with some sort of film or plastic visible between them at the edge.
Probably also a label in the corner of each piece with the glass type on it.
Tempered glass was traditionally the only thing used is for side and rear windows.
A simple center punch will shatter the entire piece.
Laminated glass is used for windshields and now very common to be used for the side windows. More common than you think. RAM pickups have used it for almost...
Be weary of high lift long duration cams which may have increased overlap as well.
This may work well on the street but causes issues on a marine engine, exhaust reversion will draw water into the cylinders.
Not for canvas replacement but I’ve met Kevin. He’s straight forward and will help you with anything.
He took time to help me with my own reupholstry project, and he does VERY high quality work himself.