Conversion advice

irieman

Cadet
Joined
Aug 9, 2024
Messages
23
I have a old 86 chevy 5.0 omc the drive unit is out and transom hole is solid think they were starting conversion my question is what drive can I put on I was looking at a sei 116 but don't know what else I'll need boat has no pulley for hydro rams on tilt any advice will help
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
49,537
Is the transom hole a key-hole shape, or the earlier 16" roundish square hole?
 

irieman

Cadet
Joined
Aug 9, 2024
Messages
23
I hole has been filled little rough with the glass but figure I can sand down and do some resin or glass over to make smooth the hole looks to big big sqaureish hole I assume from what I can see the inside IA complete looks smooth
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
49,537
If you had the big square hole, the boat had a stringer drive

Basically nothing related to that motor, drive, controls is really compatible with the SEI drive other than the short block.

The best conversion is to remove everything OMC and get a 1992 or newer Mercruiser long tail (motor and drive compete from pulley to prop)

It does require redoing the motor mounts, transom and stringers to match the Mercruiser/Volvo installations
 

irieman

Cadet
Joined
Aug 9, 2024
Messages
23
I just did lil research and I think I can convert over to sei but will need 550 dollar conversation and trim rams and drive motor I can keep from what I've gotten off internet
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
49,537
You need much more than that to convert a stringer to SEI
 

irieman

Cadet
Joined
Aug 9, 2024
Messages
23
Maybe a pulley for hydro and shift cables and steering but I'm talkn strictly drive system
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,953
Maybe a pulley for hydro and shift cables and steering but I'm talkn strictly drive system
If you had a stringer drive, there is no conversions,....
If you had a cobra dive, the Sei is possible,.....
But, you haven't said what you have to work with,....
 

irieman

Cadet
Joined
Aug 9, 2024
Messages
23
It's only a boat and a chevy v8 small block paid 800 for boat the transom hole has been reglassed don't know what drive they had in it but motor is 86 5.0 had compression test and al cylinders good did I get a bad motor
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
49,537
the hole looks to big big sqaureish hole
This says it was a stringer drive

That means the motor and drive were left over 1984 parts. Not the 1985 and later cobra drive

Is the motor painted silver, or charcoal?
 

irieman

Cadet
Joined
Aug 9, 2024
Messages
23
It's in storage but it's hole looks 16 inches kinda square but it's been filled with wood and fiberglass the only visible on outside of boat it's lil rough with the glass resin and mat but that's easy fix if motor can't be used boat is useless
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
49,537
You have a boat that had a stringer drive. The only thing usable is the block and heads
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
49,537
The paperwork says 86 beachcraft 192s
Boat manufactures use motors they have in the warehouse.

For example. GM quit building the 8.1 Big Block in 2008. Yet they were being installed in new boats as late as 2014

Your motor is a 1981-1984 vintage that had a stringer drive
 

irieman

Cadet
Joined
Aug 9, 2024
Messages
23
I I'm new to boats what's that mean as far as restoration or modifying looking to only spend 6k maybe 7
 

irieman

Cadet
Joined
Aug 9, 2024
Messages
23
The pre owner redid all inside added radio new decking was wondering why so cheap it's nice boat but no drive and now I guess no motor
 
Top