Easiest Conversion

Rranger

Chief Petty Officer
Joined
May 18, 2009
Messages
449
Ok have a line on a couple complete 4.3 setups. And I do look to find answers but again some differing answers on the motor mount questions. My boat is a Glassply so obviously 470 to 4.3 previous adapts have been done. Is there a measurement I can use to be sure my mounts are wide enough for the 4.3 to fit and are the stringers on each side in theory capable of attaching motor mounts for the 4.3? If I have to do a bunch of stringer modifications, I may as well install my pod.
 

Scott06

Admiral
Joined
Apr 20, 2014
Messages
6,370
Ok have a line on a couple complete 4.3 setups. And I do look to find answers but again some differing answers on the motor mount questions. My boat is a Glassply so obviously 470 to 4.3 previous adapts have been done. Is there a measurement I can use to be sure my mounts are wide enough for the 4.3 to fit and are the stringers on each side in theory capable of attaching motor mounts for the 4.3? If I have to do a bunch of stringer modifications, I may as well install my pod.
this page has links to install drawings of many merc products- any of the 4.3 will have the motor mount locations. The as long as existing stringers are wide enough glassing in mount blocks is no big deal. If they are too close widening them may push you towards the pod.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
49,342
knowing how some pods are built, I would add mounting blocks to your stringers.
 

Pmt133

Chief Petty Officer
Joined
Jan 6, 2022
Messages
545
The bare minimum stringer width needed for a 4.3 or 5.7 from merc is 24 inches if I remember right from my swap. Realistically 26 would be better as it's very tight at 24... I used every inch of it.
 

Rranger

Chief Petty Officer
Joined
May 18, 2009
Messages
449
The bare minimum stringer width needed for a 4.3 or 5.7 from merc is 24 inches if I remember right from my swap. Realistically 26 would be better as it's very tight at 24... I used every inch of it.
Appreciate that Pmt133: I will be measuring tomorrow.
 

Rranger

Chief Petty Officer
Joined
May 18, 2009
Messages
449
I might be dumping it anyways. I packaged the pod and the Glassply and I’m getting a lot of interest. Call it a fishing expedition.
 

Rranger

Chief Petty Officer
Joined
May 18, 2009
Messages
449
I inherited a 22’ Slickcraft 225 chev OMC so sold the Glassply. OMC runs strong but would like to get a donor Which will be a topic for another day. Motor is strong but would like to transition it to mercruiser if I can find a similar Mercruiser motor and key to prop tip setup.
 

Attachments

  • IMG_0185.jpeg
    IMG_0185.jpeg
    116.6 KB · Views: 10
  • IMG_0175.jpeg
    IMG_0175.jpeg
    118.9 KB · Views: 9
  • IMG_0176.jpeg
    IMG_0176.jpeg
    368.9 KB · Views: 9

dubs283

Vice Admiral
Joined
Jul 27, 2005
Messages
5,322
I inherited a 22’ Slickcraft 225 chev OMC............would like to transition it to mercruiser if I can find a similar Mercruiser motor and key to prop tip setup.

You'll need to install a new transom in the boat and cut the keyhole for a mercruiser transom assy. Might also need to refab the stringers/mount areas depending on engine choice

Plenty of info/help right here on iboats in the restoration forum
 

matt167

Rear Admiral
Joined
Sep 27, 2012
Messages
4,138
The OMC stringer transfers the load directly to the stringers. Mercruiser, Volvo and OMC cobra transfers to the transom. You may find you need to change the design structurally as well as close up the hole, but there’s also a good chance that your boat was available with a mercruiser so it may be okay as designed
 

Dubed

Petty Officer 1st Class
Joined
Sep 3, 2021
Messages
373
Jeez. Honestly, rebuild the 3.7 and call it a day
 

Scott06

Admiral
Joined
Apr 20, 2014
Messages
6,370

Rranger

Chief Petty Officer
Joined
May 18, 2009
Messages
449
Top