sixmassive

Thanks james, i appreciate the input. the boat runs pretty well with the single. there are just a few things that scare me. I originally wanted to build the block to 385 w/ EFI and run it, but the stories from people on S&F send me looking into other options. But it is nice to see you have faith as i originally did.

it is the 86 300 not the 275. it is the 25" shaft, and the exhaust snout was not available except on the 20"mid. the 25" mid actually measures to 28"(i read on S&F)

i tried to change the water pump yesterday but the drive shaft is stuck in the crank and i couldn't get it out. tried wedging it with wood and cranking it to loosen it up but no good. i will need to put some real force to get it out. the motor is still on the boat and only 4 bolts are in the bracket holding it to the transom so i was cautious.

Richie told me the setback is way to much on the boat. but without that setback the motor wont tilt all the way up. i dont mind that much though. If i knew the ideal CG and what a light boat CG was i could figure out what moment i needed and have the proper setback.

I heard the V8 gear cases dont like to surface and when they do, they grenade. I'm running a 21 mirage plus 3 blade and have had the boat to 5500 and it had more. But the steering is so loose and no tabs, it gets squirrely.

I was talking to Monty Racing about building the block and he wanted to bore it to a 4.0. He said the 3.6GT was not as good as the 4.0.

I was really gun hoe about the V8 because of the looks it got and the sound until recently. i really have no desire to do 80, and wanted to keep it simple.

this post was a little longer than intended lol. sorry

here is a pic of the motor up close.

JamesGang

I'll take a 3.6 over a 4.0 any day. It takes quite a bit of work to get a 4.0 to go as fast as a 3.6. The 4.0 does have better bottom end though. 3.6 pulls strong to 6600 the 4.0 to 6200. 3.6 is a faster engine stock. That era gearcase is a little weak for that engine but will go for a while if your not barking it too much. You can replace it with a brand new one from Evenrude that will be more durable. As far as set back I would want 32". I had 2 4.0s on my 31 with 32" of set back and it was fine and ran over 80 but not stock, ran 75 stock. I'll ask a friend of mine if he has any ideas for you on breaking that drive shaft out of crank.

30ctsutphen

I have heard dry oice on the shaft will break it loose froma crank.

JamesGang

How do you get it to that area?

JamesGang

OK Six I just got off the phone with a friend of mine that does this stuff for a living. You keep trying for a while. I'll tell you how to do it when you have weighed out all other options. Your not gonna like how its done, and I don't want to ruin your weekend thinking about it.

30ctsutphen

I dont know that was the extent of my knowledge on this one.LOL

all I know is when I was in ST lucia they had an OB hanging by its power head. and this guy was jerkin the sticks on a back hoe to try and get it apart and the owner of boat I was going out on was telling me how all they needed was some dry ice on the shaft and it would pop right out.
Never asked any more questions because I never thought Id own an OB boat at that time.

I guess the shafts get really corroded in the crank down there and its a pretty common problem.

Maybe he meant the CRANK shaft?

sixmassive

Great. . . I'm guessing i need to hang the motor upside down from a tree and leave it there for a month? lol

In regards to setback, i was guessing if i moved the motor forward, I would achieve better balance. It would be alot easier if i knew that CG i wanted and what is the original. i guess when i do change the bracket i need a jack plate too so i can raise the drive height.

sixmassive

there is a set of second effort motors on scream and fly right now. i dont need two though.

JamesGang

Lot of nice hardware there but two V8s is too much weight on the back of your boat. 2 300Xs would be about as heavy as I would go and also only with off shore mounts to help with the handling. You should just set up what you have, have some fun, and when its worn out then re rig with twins. A friend of mine is gonna set up a Rum Runner with 2 300X engines on it. I'll let you know how it runs when he is done. May be a while though he is doing a complete make over on the whole boat. Spring or early summer it should be done. If it turns out you definitely cant get that gearcase off call me on my cell 845-641-3322 and I'll tell you how to do it. Don't call till your desperate cause its aint a pretty fix.

sixmassive

thanks. if i can find a new drive shaft, i will sawzall it off and replace the drive shaft.

thanks for all the info though. i appreciate it