LS Swap Seafari 25

[Xcomunic8d]

New plan:



This cost is about $1300. I spent about $800 on brass fittings and 200 on the plate to plate. Fortunately I can return the other stuff. It’s not much difference to do it in a better way. Hope this helps others dealing with this.

I’ve found that crusader (also pleasure craft marine I believe they are under the same parent company) use a LS based engine in some instances (6.0). I know Ilmor and I believe Indmar utilize the LS. However, I’m excluding them for this conversation. My preliminary research shows crusader is the least expensive and most readily available.

I prefer Crusader die to the full closed cooling design. The Hardin Marine setup only does half closed (block only not exhaust) and costs $1600. https://www.hardin-marine.com/p-7409...per-brass.aspx

Here is a link to the Crusader parts manual. Throughout the drawings reflect LS architecture.

Please see:
pic on p1
Pic on p8 of water pump diagram
Pgs 32-41 diagram the closed cooling and detail the setup for the 6.0

https://www.crusaderengines.com/wp-c...03/L510018.pdf

Here’s another view of the cooling diagram

https://macombmarineparts.com/pages/...tem-components

Parts required:
Heat exchanger- RA0147048a

Marine parts.us:
Heat exchanger Thermostat housing and splitter - r025038- $65.35

Perf protech:
Heat Exchanger Bracket- r090258- $137.15
Degas bottle- r146001-$75.38
Degas cap- r034045- $23.36
Degas bottle bracket?

Various suppliers:
Water pump inlet and threaded port- R025036 $44.27 p8 of crusader diagram

Searching for:
Water pump tee- R025035a

Misc hoses and clamps.

I’m still searching for the water pump Tee r025035a. I already made my own out of brass fittings and reducers. I used a 1.25” brass tee with 1.25” hose barb fitting inlet and reducers to 1” hose barb outlets. I suspect the crusader part r025035a would be much less expensive.

Per our first call, I learned that 1hp =2,500 BTU’s. However that number does not include the cooling requirements of a full closed system. Maybe you can back into it from the information provided.

Closing notes in exhaust manifolds. I bought these from Hardin Marine https://www.hardin-marine.com/p-1045...-53-60-62.aspx

I wanted to keep iron out of the boat in my salt water environment. However, I did not consider that I might need exhaust riser spacers. I am now faced with definitely needing spacers and will probably have to fabricate them myself. I would tell others to buy the crusader or pcm exhaust elbows and risers if they might need spacers. Perforate h has a good article about this.