1 piece ot 2 piece rear main????

[scon]

my boat currently has a 1 piece rear main but im having trouble finding another 1 piece rear main block.....can use two piece?....i know the cranks are different but what im really need ing to know is what is all behind the motor i have not pulled engine yet,,, is it a typical flywheel back there and what bolted to it? if i put a two piece rear main in there will all i need is another flywheel??? current motor is a 305 and im replacing it with a 350 bottom end...cranks are the same but bolt pattern between 1 piece and 2 piece are not,.....???

 

[Fishermark]

Re: 1 piece ot 2 piece rear main????

The flywheels are different, as are the couplers - other than that you can use the newer block.

 

[LAC_STS]

Re: 1 piece ot 2 piece rear main????

On the 5.7 the older style 2 Pc seal is a 3 1/2" bolt pattern flywheel. The newer style is a 3".

I had to buy a new flywheel and coupler when I bought a new engine a couple months ago because I thought the old engine was the 1 Pc and it wasn't.

 

[zbnutcase]

Re: 1 piece ot 2 piece rear main????

The oil pan is different also.

 

[Aloysius]

Re: 1 piece ot 2 piece rear main????

1 piece rear main blocks have been produced since 1987...keep looking!

 

[Cpt D]

Re: 1 piece ot 2 piece rear main????

1 piece rear main blocks have been produced since 1987...keep looking!

Much agreed. Keep looking. Not hard to find.

 

[scon]

Re: 1 piece ot 2 piece rear main????

i know the flywheel cant be much over 40 bucks but how much is this coupler? and are they readily available?

 

[Bondo]

Re: 1 piece ot 2 piece rear main????

but im having trouble finding another 1 piece rear main block.....

Ayuh,... You can't be lookin' too hard...

but how much is this coupler? and are they readily available?

Ayuh,... They're available,... $250./ $350. should cover it... Still the wrong way to go though...

 

[LAC_STS]

Re: 1 piece ot 2 piece rear main????

Here at iboats eu sold my coupler for $199 bit I paid $230 just to get it faster. You will also need a new flywheel. That's another $100-150.

Just get a 1 pc like you have now.

 

[scon]

Re: 1 piece ot 2 piece rear main????

bond-o,,, motor is out and it is a one piece rear main..i now have a 350 1 piece rear main goin back in...before i install new engine is there anything i need to do(preventative maintance) or should do before i install the motor? im replacing the belows cause one of them is leaking. and this winter i will be completely redoing the interior as well as replacing the floor.. i had someone tell me about diabond,they said it worked great for floor material in a boat since its strong and light.? but other than that what do i need to use.id like to keep it as light as apossible to..whats the correct way to replace the floor?
thanx

 

[coheej]

Re: 1 piece ot 2 piece rear main????

Are you using the heads from the 305? If you put the 305 heads on the 350, your compression very likely will be too high. Be sure the chambers of the heads are not too small.

 

[wca_tim]

Re: 1 piece ot 2 piece rear main????

bond-o,,, motor is out and it is a one piece rear main..i now have a 350 1 piece rear main goin back in...before i install new engine is there anything i need to do(preventative maintance) or should do before i install the motor? im replacing the belows cause one of them is leaking. and this winter i will be completely redoing the interior as well as replacing the floor.. i had someone tell me about diabond,they said it worked great for floor material in a boat since its strong and light.? but other than that what do i need to use.id like to keep it as light as apossible to..whats the correct way to replace the floor?
thanx

Gimbal bearing will likely be in need of it if the bellows has let water in, checkl the rear mounts to be sure they haven't colapsed and if your floor is rotten, you may well have a much bigger job on your hands - often that means stringers and maybe even transom are in need of work. I'd check the structure under the front mounts carefully for rot - the engine woud most likely have to come out if you;ve got stringer problems anyhow...
Lower shift cable, paint the bilge area while you're there and whatever else the man says to check...