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Block 14015445 454 78-90 2 or 4 bolt main Head 14081045...78-87...oval...OPEN...454 Parts Head 14092360 ...86-90...oval...OPEN...454 Truck, "peanut" round ports Unless someone like @Scott Danforth has something to add it's a non-issue, just install and cut the gasket away. I don't see much of...

Look on the rear of the block and directly below where the distributor is. On the top deck of the block there is a number, what is it? On the heads look in between the rockers and on the ends, see what casting number is there?

I don't see it as a gasket issue, it looks to me as a wrong intake. The 2 bolts shown should be on each side if the center opening. Don't see how the bolt on the right is even close to the hole. Also the intake is not high enough and should be real close to top of head

Thank you for closing out

Single engine setup and multi engine setup

Yes it's a drain hole, don't plug it

Sir, this kind of posting will not be tolerated.

For years I wanted to setup the same thing but for a different reason. If it gets real hot and stays that way with no rain the fresh water lake gets so warm it's like taking a warm bath. So I thought about hooking up a bilge pump and about 15 ft of hose to pump cooler water up to the top. Never...

My question would be who is going to clean up the mess?

What are your compression numbers? Is The fuel pressure between 50 and 60 psi?

In most cases if none of the lights are working with a 4 pin plug it's the ground (white wire) https://www.etrailer.com/faq-wiring-4-way.aspx

I don't know enough about the differences to comment, hope another can

Bummer, you are having a time with it for sure

Then as Bondo said they are junk

It can be, I would disconnect the pump or remove the impeller to be safe Cold is better than nothing and should provide some insight

Cracks in manifolds would either leak outside where you can see it or put water in the cylinders If your a fresh water boater I doubt your Mans need replacing

Most likely the threads need to be chased with a tap. The tap would be NPT type. Sierra parts are a roll of the dice. Barr makes manifolds for Merc

Here is the LINK to download the software. It's legal to download and use, it just will not work for diagnostics on a motor without purchasing the adapter

Finding Yam 150 WOT is 5000-6000 RPM Stainless will have thinner blades which means less drag. More blades means more drag and more stern lift and IMO you don't need more lift. I would try the stainless 3 blade 15 which will increase your WOT RPM and should help with hole shot and might help...

What? you haven't built a boat???