LS Swap Seafari 25

[FishStretcher]

If possible, mount electronics in a cooler, lower vibration environment. So the transom would be my preference.


With respect to the raw water pump. I can't tell where the bracket mounts- is it the block? This configuration means that the mass of the pump is hanging off the end of the crank, as that flat strapping won't support the pump body and in fact may add additional load. I would worry about fatigue failure from vibration.


I wonder if one from something like a 350 MAG MPI could be retrofit?


Or something like this, remote mounted: https://daviescraig.com/category/ele...ater-pumps-ewp

[Xcomunic8d]

Yeah I agree the transom is probably dryer. And will be less fab work to make an aluminum bracket off the headers.

That electric pump would have been cheaper than my scenario. And probably save hp. But I’m not sure I can return it. This is how ilmor does their Ls motors. I got the kit from marine enginedepot.com and bought the Johnson pump off Amazon.

Here’s closer up pics. No weight bearing on crank but obvious loss of hp.

Mounts to block






Has a flange that the crank bolt goes through and gives mounting point for water pump.



I’ll kick your idea around but I’m getting pretty far down the road here. That’s exactly what I needed a month ago. I absolutely would have used that. But, I doubt I can return some of this stuff. Once wiring is done hopefully can fire it up once pcm comes in from tuners.