These are the heat exchangers & mounts out of my sadly missed BAM Cigarette
I was running about 1000 hp each when I retired the boat and these more than handled it. I made them way oversize planning for future upgrades that never happened. They were mounted between 2 bulkheads which is why the ends are closed instead of being removable. It should be possible to have the ends changed.
The expansion tank is divided in the middle.

I first put closed cooling in the boat in 1982 or so. I upsized the exchangers when I put blower motors in. They have 400 hours on them.

Offers accepted for the pair only.