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There will be a casting # at the rear of the block behind the last cylinder on the starboard side. There is also a GM serial number on the front of the block right near where the cyl head mates up, same side. The tag near the starter referred to above is a Merc serial number, not GM. The casting...

Correct you may have to experiment to find the right one; if you can find a shop that deals in propellers that can lend a few different pitch props that you can try out, otherwise it gets expensive. I started with a 14.5x19 (too low, 4500 ), went to a 15x17 (better 4700 rpm), and wound up with a...

And be careful when removing bolts in aluminum housings like an outdrive. Take your time & don’t rush and if the Merc manual says to put Perfect Seal on the threads then do so because it prevents corrosion & seizing of bolts. I use OMC gasket sealer and it works great to prevent seizing.

If it’s a 2bbl Mercarb I think that it’s a modified Rochester 2BBL carb. You might ask this question on Cliffs High Performance Quadrajets forum someone may know.

the original gear ratio with the V6 would have been about 1.60:1, so what you have is probably from a 4 cyl application. That will limit top speed but the acceleration on plane should be quite fast. The standard prop with the V6 Cobra was 14.5x19 or 15x17 depending on the size and weight of the...

Sometimes it seems as if you don't have water in the oil in the pan because it doesn't get into the dipstick tube until it gets really bad. What's happening is that there really is water in the oil and when it gets to the top of the engine, since the oil up there is cooler than in the pan and...

here's what the intake port looks like on an older raw water cooled engine. who knows how close to rust thru they were.....

sorry duplicate post!

Yep an 05 is the SX series with a conventional gimble bearing like an OMC Cobra some parts are actually the same. You probably have water in the bellows so check the u joints and input shaft seal (rust on shaft can cause seal to fail oil leaks). This is why I/O owners should pull the drive once...

I did the same thing on my engine when it was about 29 years old used 15+ years in salt water. Due to an overheat both heads were cracked in the valve seat area in the center cyls on the V6 head. The machine shop I took them to felt the cooling passages were getting too eroded for them to seal...

Find one that caters to American muscle cars.

Sorry just saw it!

Wow that looks great! I never learned how to do upholstery, only went as far as replacing the backing wood panels. Soon it will be like new.

3-1/2" to 4" I.D. External Flapper - Hardin Marine (hardin-marine.com) something like this, if its the right size, you have to measure the opening in the gimble housing. I know the Y pipe is 3.5" at least it is on mine.

I took a look at the diagrams, it appears for that year range the engines still could come with a mechanical fuel pump, I'd check yours to see if there is a block off plate that can be removed, (it depends on what engine block was used when they replaced the original) if so I'd use the...

You’re welcome! Hopefully that solves it. On my boat I have the OMC 4.3 V6 which originally had the one piece batwing manifolds. In the 15 years I ran it with them I never once had a hydrolock from water coming up the exhaust. The only time I had water in a cyl was due to a blown head gasket. I...

Also, when using the carb instead of EFI I would have gotten rid of the fuel reservoir there is no need for it on a carbed engine and gotten a Carter low pressure fuel pump and make sure it is wired correctly so that you have power to the pump during cranking from the terminal on the starter...

It’s what I said earlier. I’d pull the drive then get a snap ring pliers. Remove the snap ring that holds the aft end of the exhaust bellows in the pivot housing then take off the clamp on the front end of the bellows on the gimble housing. Then pull out the exhaust bellows. Now install an...

Ok judging by your pic you’re not sitting low in the stern, mine sits lower, the waterline on mind is right at the top of the part of the transom mount that moves side to side. As in right under the trim piece that says OMC on it. You seem to be an inch or so higher. I measured my static water...

If it were my boat I'd look into removing the exhaust bellows, and adding a flapper valve over the gimble bearing exhaust opening.