[macojoe]

Well hers is what I no.

The floor is lower in the older models just like labii says.
So getting a regular size tank in there will not work.

You will have to remove the deck and have to make new bulkheads to hold the tank were you want it.

The boats were made balanced, and changing the tank from were they are now will change the center of gravity, making the boat much more bow heavy!

IMO the under floor tanks take a lot more abuse as far as corrosion, and some here can tell you about that!

Now all these things said, rules are made to be broken!! I have a 1975 I/O with 20 gal saddle bag tanks, they are in perfect condition after 30 years.

But 40 gals was just not enough for me as i like to go offshore from time to time.

My boat has been converted by me. It now has a bracket with a 175 Yamaha.

I have changed the center of gravity by moving 500 pounds of motor from the rear of the boat to 29 inches behind the boat.

This made the bow ride high, but could be controlled by trimming the motor.
You will not be able to do this if you put a tank in the floor to far forward! Because it will make the bow heavy!

I have fixed this problem by adding a 25 gal tank in the rear of the boat in the old motor well. which moved about 200 pounds back into the boat. This has helped bring the bow down, and I now use less trim.
And it has increased my capacity to 65 gals.

With the space you will have under the floor for a tank, you will not gain any fuel, you may be decreasing the amount?? depending on what you are able to get down there?

You may have to move bulk heads or build them? Not to mention redesigning the floor, as you now have floor storage that Will have to be removed.
Now you have lost valuable space to store fish, bumpers, ect ect..

All this will cost $$$ and for what?? To make a 30+ year old boat have less storage, less fuel, and for what? some gunnel space for a few rods.

There are kinds of things you can do to make rod storage! with out having to go thur so much trouble!!

I had a idea that I was going to do, but I did other things instead.

You can drill some holes in the front bulk head walls for the rod butts and put you rods in front of the gas tanks. You have a double wall there on the sides to add clips to hold the rod tips.

I have added 5 rod holders on the out side of my windshield, this keeps the rods, and gives me space in the **** pit were i need it most!!

So unless you have tons of $$, tons of time, and need something to do, It is not worth it!!

Now see what you did!! you got me running a muck, and I never do that!!